circovirus disease in kansas what a difference a year can ...€¦ · funding from npb, ksa...
TRANSCRIPT
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Circovirus Disease in Kansas
What a Difference a Year Can Make!
Your K-State PCV2 Team
KSU Swine Day
November 15, 2007November 15, 2007
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HistoryHistory
Nov 2005Nov 2005
Disease appears in multiple Kansas farms with many stunted and wasting pigs, mortality 8-30%, we don’t know much!,
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HistoryHistory
Nov 2005Nov 2005
Disease appears in multiple Kansas farms with many stunted and wasting pigs, mortality 8-30%, we don’t know much!,
Jan 2006K State PCV Team formed; diagnosticK-State PCV2 Team formed; diagnostic methods, virus isolation and identification, impact of disease
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HistoryHistory
Nov 2005Nov 2005
Disease appears in multiple Kansas farms with many stunted and wasting pigs, mortality 8-30%, we don’t know much!,
Jan 2006K State PCV Team formed; diagnosticK-State PCV2 Team formed; diagnostic methods, virus isolation and identification, impact of disease
Feb 2006Funding from NPB, KSA
d d ff t d f iproducers and affected farms, virus identified as PCV2b strain
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HistoryHistory
July 2006K-State VDL develops genotype-specific diagnostic assays for tracking PCV2a&b virus
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HistoryHistory
July 2006K-State VDL develops genotype-specific diagnostic assays for tracking PCV2a&b virus
Aug 2006Began first vaccine trial with SutherBegan first vaccine trial with Suther Farms, 2 dose conditionally licensed vaccine
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HistoryHistory
July 2006K-State VDL develops genotype-specific diagnostic assays for tracking PCV2a&b virus
Aug 2006Began first vaccine trial with SutherBegan first vaccine trial with Suther Farms, 2 dose conditionally licensed vaccine
Nov 2006 - Swine Day! Almost all farms are affected at
l l E l i t i lsome level. Early vaccine trial results = reduced mortality
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HistoryHistoryFeb 2007Vaccines becoming available and V cc es beco g v b e dproducing excellent field results in reduced mortality
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HistoryHistoryFeb 2007Vaccines becoming available and V cc es beco g v b e dproducing excellent field results in reduced mortality
Nov 2007 – Swine Day!Most farms are vaccinated, new cases are rare, performance fantastic!p
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HistoryHistoryFeb 2007Vaccines becoming available and V cc es beco g v b e dproducing excellent field results in reduced mortality
Nov 2007 – Swine Day!Most farms are vaccinated, new cases are rare, performance fantastic!p
Case closed?N t b l ! M t i l pl t dNot by a long ways! Many trials are completed, others are ongoing, many questions and puzzles that need answers.
Your K-State Team is busy at work!
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Where we were a year agoS i D 2006?Swine Day 2006?
• It was still a pretty grim story llast year.
• Mortality rates were rising in herds across Kansas.
• We left you with the followingWe left you with the following slide at last year’s Swine Day……
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Even if vaccine stops the bleedingEven if vaccine stops the bleedingWhat about the future?What about the future?
Field experience is limited and a great deal is to beField experience is limited and a great deal is to beField experience is limited and a great deal is to be Field experience is limited and a great deal is to be learned yet (need field research, Dr. Dritz!)learned yet (need field research, Dr. Dritz!)
How does this virus move around?How does this virus move around?Impact on morbidity, will growth benefit?Impact on morbidity, will growth benefit?44--22--2 vaccine and 32 vaccine and 3--22--1 virus? 1 virus? Timing of vaccination does it vary with immune status ofTiming of vaccination does it vary with immune status ofTiming of vaccination, does it vary with immune status of Timing of vaccination, does it vary with immune status of pigs?pigs?Does preDoes pre--existing viremia compromise vaccination?existing viremia compromise vaccination?How is breeding herd vaccination best managed and what How is breeding herd vaccination best managed and what is the benefit/lack of benefit?is the benefit/lack of benefit?Need tools to measure immunity!Need tools to measure immunity!Need tools to measure immunity!Need tools to measure immunity!These other viruses These other viruses –– Why? What? How serious?Why? What? How serious?
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What has been learned?• Nearly all herds are affected at some level by y y
circovirus infections, not just those infected with PRRSv and other agents.
• Immunization results in dramatic reduction in mortality
• Immunization results in an amazing and surprising improvement in growth in all trials
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Vaccines to the forefront• Three companies have vaccines licensed in the USp
− Intervet – 2 dose baculovirus-vectored, killed vaccine− Fort Dodge – 1 dose chimera, killed vaccine
Boehringer Ingelheim 1 dose baculovirus− Boehringer-Ingelheim – 1 dose baculovirus-vectored, killed vaccine
• All cost about the same, all result in reduced cost about the sa e, a esu t i educedmortality and improved performance
• Unlike last year, vaccines are now readily availabley , y
• Trials comparing vaccine performance – some are completed, others still underwayp , y
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T i i dTopics to review today• Vaccines – how do they work, differences?
• Growth – what is the impact in immunized animals?
• Immunity – how can we use antibody to guide best vaccine use?
• Genetics – is there a difference between genetic lines in response to vaccine?
• Diagnostic methods – next generation methods from the K-g gState VDL
• PCV2 itself – is it changing and what does that mean?
N l d d diff i i i• New tools – tests needed to differentiate strains in infections, vaccinated successfully vs. failed to immunize
• Virus elimination – is it possible?
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The key to solving any l bl icomplex problem is
the right team plusthe right team plus teamwork.
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Coach Prince has his version…Coach Prince has his version…
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Now we bring you our own K-State PCV2 Team version of the CATS 2007!
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Bring on the Cats
• At Center, taking in cases as they come
~ Dr. Jerome Nietfeld
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B i h CBring on the Cats
• Wide receiver, taking the ball and running itthe ball and running it in new directions – ‘get that man the ball!’
~ Dr. Bob Rowland
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Bring on the Cats
• Veteran at quarterback, calling the next play
~Dr. Dick Hesse
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Bring on the Cats
• At safety, preventing disaster “not indisaster, “not in OUR house!”
D S D i~Dr. Steve Dritz
“In God we trust; all others must bring data!”
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Bring on the Cats
• Punt returner, sendingreturner, sending it right back at youy
~Dr. Dick Oberst
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B i h C Off i liBring on the Cats ~ Offensive lineGetting the job done.
Dr. Jay Jacela Dr. Megan Potter Dr. Kyle Horlen(outstanding walk‐on) (new top recruit
out of Purdue)(lost to aggressive
recruiter from Texas)K-STATE
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Bring on the Cats ~ Defensive LineBring on the Cats Defensive Line
Mike HaysSu‐Ann Murdock
Joe Anderson andJoe Anderson and Jessica Jewell
Heather WisdomAmanda McGarryKK--STATESTATE
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Bring on the Cats ~ Special TeamsBring on the Cats Special Teams
Scott Hahn
Maureen Kerrigan
Ben Trible
Maureen Kerrigan
BrandiStruveKK--
STATESTATE Sean Smith
Struve
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Bring on the Cats
• Recruiter, Athletic Director and Funding Pitch-man
~ Dr. Steve Henryy
“In God we trust; all others must bring money!”
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Bring on the CatsP f h 4th• Punter, for those 4th
and long situations (and several game-(and several game-saving tackles!)
D Li T k h~ Dr. Lisa Tokach
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It Takes Teamwork!
Suther Farms
HENRYSLIMITED
K-STATE
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Critical Support and Key EffortsS d f d d C• K-State administrative support – Drs. Wefald, Richardson, Chengappa
and Anderson
• K-State VDL team – Drs. Rowland, Nietfeld, Hesse and Oberst , ,developed methods in efficient diagnosis
• K-State developed the PCR test to differentiate PCV2b from PCV2a
(Rowland)(Rowland)
• Whole genome sequences for specific, unique identification (Rowland)
• Identified other (unexpected) viruses in affected animals (Hesse)• Identified other (unexpected) viruses in affected animals (Hesse)
• Linked vaccinology/immunology between the lab and the field (Hesse)
• Adaptation of the long respected K State Swine Team methodology in• Adaptation of the long-respected K-State Swine Team methodology in nutrition investigations to disease interventions (Dritz)
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Critical Funding
• K-State (Horlen, Dritz) and Suther Farms –vaccine research trial funded by National Pork Board
• KSA farms provided 50¢ per weaned pig for a year to support KSU investigations ($32,000)and still contributing!
• Dr Rowland’s lab and research budget• Dr. Rowland’s lab and research budget
• K-State VDL services
• Pork producers and production systems both in and outside of Kansas
• M r r nt h b n rd d m r f ndin i b in• More grants have been awarded, more funding is being sought
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Critical Funding
• Your contributions matter!
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Publications• Kansas herds are affected by PCV2b (321) strain of PCV2
P th KS Cl t bli h d JSHAP 2007− Paper on the KS Cluster – published JSHAP 2007• Immunized animals respond with decreased
mortality, increased growth rate - even in herds with mild clinical signsclinical signs− Suther study – accepted JAVMA
• A specific, differential PCR test was developed (Rowland) to sort out PCV2 (422) and PCV2b (321) infections and co-sort out PCV2a (422) and PCV2b (321) infections and coinfections− 24 of 97 cases were co-infected with PCV2a and PCV2b− Recent discovery of a 321/422 recombinant virus at K-
State first to document recombination in North AmericaState, first to document recombination in North America Manuscript submitted - Virus Research
• And more coming…
K-STATE
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Key points we’ve learned since weKey points we ve learned since we last met
• Circovirus disease is a population-base immunological dysfunction
• PCV2b is a primary pathogen in swinePCV2b is a primary pathogen in swine
• Immunization dramatically improves growth performance and lowers mortality
• “Vaccination” and “Immunization” are not equivalent definitions with current vaccines
• Animal genetic lines differ greatly in response to immunization
• Reassortments and new variants are being discoveredReassortments and new variants are being discovered
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Key points we’ve learned since we last met
• Immunization effectively lowers mortality, consistently improves growth rate with evidence of improved feed efficiencefficiency
• Immunized animals have low concentrations of virus− Identified by differential QPCR methods developedIdentified by differential QPCR methods developed
at K-State and the only differential available in the US
“V i ti ” i t l “I i ti ”• “Vaccination” is not always “Immunization”− Antibody titer profiling
K-STATE
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K i b hi iKnowing more about this virus• PCV2 is a non-enveloped, single stranded, circular 2 p , g ,
DNA virus
• Inactivation lack thereof:Inactivation, lack thereof:− Stable at pH 3 (eats concrete)
− Resistant to dry heat of 120°C (248°F)y ( )• 30 minutes only led to 1 log reduction in titer
− Resistant to pasteurization (wet heat)• 65° C (150°F) for 30 minutes had no reduction of titer
• 75° C (who cares) for 30 minutes only reduced 1.59 logs
Welch J, Bienek C, Gomperts E, Simmonds P: 2006, Resistance of porcine circovirus and chicken anemia virus to virus inactivation procedures used for blood products. Transfusion 46: 1951‐1958.
Courtesy of Dr. Darin Madson, ISU, AASV Jul ‘07
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Formaldehyde based
Royer RL, Nawagitgul P, Halbur PG, et al. Susceptibility of porcine circovirus type 2 to commercial and y , g g , , p y p yplaboratory disinfectants. J Swine Health Prod. 2001;9(6):281‐284.
Courtesy of Dr. Darin Madson, ISU, AASV Jul ‘07
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The Suther Trial“This trial was the breakthrough in how to do trial work applied to vaccine, the pp ,growth impact, and the first trial to link laboratory virology to field performance ”to field performance.
K-STATE /Suther Farms/
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S ther Tri lSuther Trial•Fantastic support from Micki, Grace, Dan and Ron!
•300 sow Farrow to Finish Farm
•Nursery groups: One week weaning and AIAONursery groups: One week weaning and AIAO
•Finisher Groups: Two nursery groups combined into a group for hoop barn finishing ~200 head p h p b nper hoop barn
•PRRS negative
Hi i l W F li f 12 5%•Historical, recent W->F mortality of >12.5%
•History of PCVD - PCV2b (321) infection
K-STATE /Suther Farms/
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S d D iStudy Design• 485 pigs
− 250 controls & 235 vaccinates− Within litter allotment
• Randomized blind clinical trial – 6 weaning groups and 4 finisher groups
V i i 2 d (3 & 6 k ) I• Vaccination - 2 doses(3 & 6 wks age) Intervet
• Pigs weighed at weaning, end of nursery and just prior to marketprior to market
• Controls and vaccinated pigs housed in the same penp
K-STATE /Suther Farms/
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The Suther Trial
Mortality and Growth Responses
K-STATE /Suther Farms/
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Effect of PCV2 Vaccination on Mortality
25
RateWF & Fin Vaccine Effect P < 0.01
16.718.120
25Control
Vaccinate16.7
6 17 7
15
ality
, %
1 6
6.17.7
5
10
Mor
t
1.3 1.6
0WF Nur FinWF Nur Fin
Horlen et al. KSU 2007K-STATE /Suther Farms/
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Effect of PCV2 Vaccination on ADG
1.912.0WF & Fin Vaccine Effect P < 0.01
1.55
1.741.66
1.6
1.8Control
Vaccinate
1.4
AD
G, l
b
`
1.05 1.041.0
1.2
0.8WF Nur Fin
Horlen et al. KSU 2007K-STATE /Suther Farms/
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Cumulative Mortality During the Finishing Phase
20%
25%
15%
20%
ency
Control
Vaccinate
5%
10%
Freq
u
0%
5%
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 160 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16Week of Finishing Phase
10 wks
Horlen et al. KSU 2007K-STATE /Suther Farms/
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Market Weight Histogram
30%
35%Control Avg=278Vaccinate Avg=297
20%
25%
ncy
Vaccinate Avg=297
Minimum Market Weight G l
10%
15%
20%
Freq
ue Goal
5%
10%
0%150 175 200 225 250 275 300 325 350 375 >375
Weight Category, lbWeight Category, lb
Horlen et al. KSU 2007K-STATE /Suther Farms/
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The Suther Trial
Immune responses
K-STATE /Suther Farms/
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> 15PCV2 Serology
1514
p < 0.05p < 0.05p < 0.05p = 0. 6
131211(L
og2)
10987
Titer
765
n = 30n = 30 n = 31n = 30n = 21 n = 20 n = 21n = 21
< 5
0 weeks 3 weeks 6 weeks 14 weeks B f V i i B 3 k Af B Mid Fi i h
Time After Vaccination
Before Vaccination Booster 3wk After Booster Mid Finisher
Open = Controls Black=Vaccinates
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>150 050 050 050 6
PCV2 Serology
1514
p < 0.05p < 0.05p < 0.05p = 0. 6
13121110r (
Log2)
10987
Titer
65
n = 30n = 30 n = 31n = 30n = 21 n = 20 n = 21n = 21
< 5
0 weeks 3 weeks 6 weeks 14 weeks Before Vaccination Booster 3wk After Booster Mid Finisher
Time After Vaccination
Before Vaccination Booster 3wk After Booster Mid Finisher
Open = Controls Black=Vaccinates
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>150 050 050 050 6
PCV2 Serology
1514
p < 0.05p < 0.05p < 0.05p = 0. 6
13121110r (
Log2)
10987
Titer
65
n = 30n = 30 n = 31n = 30n = 21 n = 20 n = 21n = 21
< 5
0 weeks 3 weeks 6 weeks 14 weeks Before Vaccination Booster 3wk After Booster Mid Finisher
Time After Vaccination
Before Vaccination Booster 3wk After Booster Mid Finisher
Open = Controls Black=Vaccinates
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>150 050 050 050 6
PCV2 Serology
1514
p < 0.05p < 0.05p < 0.05p = 0. 6
13121110r (
Log2)
10987
Titer
65
n = 30n = 30 n = 31n = 30n = 21 n = 20 n = 21n = 21
< 5
0 weeks 3 weeks 6 weeks 14 weeks Before Vaccination Booster 3wk After Booster Mid Finisher
Time After Vaccination
Before Vaccination Booster 3wk After Booster Mid Finisher
Open = Controls Black=Vaccinates
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S f Th S th T i lSummary of The Suther Trial
• Significant reductions in mortality increased finisher pigSignificant reductions in mortality, increased finisher pig growth rate, and fewer lightweight pigs at market
• Suggests an effective level of cross-protection (vaccine isSuggests an effective level of cross protection (vaccine is 422, field virus is 321)
Bottom Line
• Vaccine is an effective tool to aid in the control of PCVD
Si ifi i b fi i i d i• Significant economic benefit in vaccinated pigs
• First field study to link virology and growth performance
K-STATE /Suther Farms/
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Virology
Things we’ve learned about this nasty little virus…
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>15
PCV2 Serology>15
1514
p < 0.05p < 0.05p < 0.05p = 0. 6
14131211Lo
g2)
111098
Titer (L
765
< 5
n = 30
0 weeks 3 weeks 6 weeks 14 weeks
n = 30 n = 31n = 30n = 21 n = 20 n = 21n = 21
Time After Vaccination
Before Vaccination Booster 3wk After Booster Mid Finisher
Open = Controls Black=Vaccinates
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Genome sequences of f ffour separate farm isolates from clinical cases cluster closely together, most like the RFLP 3-2-1 and AF055393 (French isolate)(French isolate)
Are substantially different than the RFLP 4-2-2 variants found also in affected herds and in all unaffected tested thus farunaffected tested thus far.
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Diff r nti l PCV PCRDifferential PCV2 PCRPCV2 signature motif
PCV2a (422) 1463-TATGAGATTTTGTTGPCV2a (422) 1463 TATGAGATTTTGTTGPCV2b (321) 1462-C.C...CGGGGG..A
AVirus Isolate
B
PCV2 Template b a b a Virus Isolate1 2 3 4 5 6 7 8
PCV2 Template b a b aReverse Primer b b a a
PCV2a
PCV2b
Serum SampleC 24 of 97 samples Dx lab
submissions showed the
PCV2a
PCV2b
1 2 3 4 5 6 7 8 9 10 submissions showed the presence of both PCV2a and PCV2b in the same pig
K-STATE
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Diff i l PCRDifferential PCRSYBR Green and TaqMan
High LowCon Con
Ct
CoK-STATE
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Differential qPCRqSYBR Green and TaqMan
PCV2a
PCV2b
TempK-STATE
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Melting Curve Resultsg
PCV2b
K-STATE
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PCR Results
60
Mean Vaccine = 1.3
40
Mean Control = 2.6
40
Control
Vaccine20
Vaccine
00.1 0.6 1.2 1.8 2.3 2.9 3.5 4.1 4.6
PCV2 DNA Concentration (log10 templates/rxn)
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Whole Genome S iSequencing
ORF2 ORF11767 0
PCV2a
PCV2b PCV2a
0723APCV2b
K-STATE
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The Pipestone/KSUThe Pipestone/KSU Research Trial #1
“This trial in estigated field“This trial investigated field performance results of PCV2vaccinated pigs in a controlled commercial production setting.”
K-STATE /
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Evaluation of PCV2 Vaccination in a Commercial Research Finishing Barn (Trial 1)
• PRRS POS - Historical Finisher Mortality ≈ 6%• Histopath lesions of PCVD had been previously characterizedp p y• Genetic Background: PIC 337/280 x 1050
• Commercial PCV2 Vaccine became available• Commercial PCV2 Vaccine became available
• Pigs were vaccinated at 9 and 11 weeks of age (Late!)• Pigs housed within pens by vaccination or controls in a single finisher• 24 pens (650 pigs) controls and 24 pens (650 pigs) vaccinatesp ( p g ) p ( p g )
K-STATE
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Effect of PCV2 Vaccination on Mortality -Trial 1
8
Trial 1
Clinical signsP <0 025.66
%
Clinical signs and histopath lesions
P <0.02
3.04
orta
lity, lesions
consistent with PCVD were
2Mo
noted in pigs from this barn
0
Control Vaccine
K-STATE
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Effect of PCV2 Vaccination on ADG and TFeed Efficiency - Trial 1
ADG, lb FG2 3 2 75
2.10
2.3
2.572.52
2.75 P<.01P<.001
2.03
2.0
2.50
2.25
1.6Control Vaccine
2.00Control Vaccine
K-STATE
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Economics: Mortality, growth rate, and feed efficiency improvements werefeed efficiency improvements were calculated to result in a benefit of $3.94
iper pig
K-STATE
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The Pipestone/KSUThe Pipestone/KSU Research Trial #2
“Repeated Trial #1 ith a“Repeated Trial #1 with a younger vaccination age closer to label recommendations with the next group in the barn.”
K-STATE /
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E l i f PCV V i i iEvaluation of PCV2 Vaccination in a Commercial Research Finishing Barn (Trial 2)
•Same production system and commercial PCV2
Vaccine as Trial 1Pi i d 5 d 7 k f•Pigs were vaccinated at 5 and 7 weeks of age
•Pigs were housed in the same barn as Trial 1
•Pigs housed within pens by vaccination or controls in a single finisherg•21 pens (592 pigs) controls and 24 pens (661 pigs) vaccinates
K-STATE
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Effect of PCV2 Vaccination on Removal Rate,Trial 2 d 0 to 105
8.910
Trial 2 d 0 to 105
Clinical signs P<.01
6
8
, %
and histopath lesions
i t t ith
3.04
6
Mor
talit
y, consistent with PCVD have been noted in
2
M been noted in pigs from this barn
0Control Vaccine
K-STATE
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Effect of PCV2 Vaccination on C l ti R l R t T i l 2 d 0 t 105
10%
C t l
Cumulative Removal Rate - Trial 2 d 0 to 105
6%
8%
ncy
Control
Vaccinate
4%
6%
Freq
uen
2%
0%0 2 4 6 8 10 12 14 15
Week of Finishing PhaseWeek of Finishing Phase
K-STATE
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Effect of PCV2 Vaccination on ADG and FETTrial 2 d 0 to 105
ADG lb FGADG, lb FG2.3
2 54
2.80P<.01 P<.14
2.031.96
2 0
2.48
2.542.60
2.0
2 20
2.40
1.62 00
2.20
Control Vaccine2.00
Control VaccineK-STATE
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Effect of PCV2 Vaccination on ADG over Time
2 5
2
Trial 2 d 0 to 105
2.26
2.061 98
2.202.14
1 92
2.26 2.29
2.132.24
1 95
2.5Control
Vaccinate
1 52
1.881.98 1.941.92
1.75
1.952.0
AD
G, l
b
1.521.491.5
A
1.00 to 14 14 to 28 28 to 42 42 to 56 56 to 70 70 to 84 84 to 98 98 to 105
Period DaysPeriod, Days
K-STATE
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Effect of PCV2 Vaccination on C l ti R l R t T i l 2 d 0 t 105
8 4%8.9% 9.3%10%
Cumulative Removal Rate - Trial 2 d 0 to 105
6.5%
8.4%
5.6%6%
8%
cy
Control
Vaccinate
3.3%
2 3% 2.8% 3.0%1 5% 2 1%
4%
6%
Freq
uen
0.0%0.0%0.7%
1.7%2.3%
0.6%
0.9% 1.5% 1.5% 2.1%
0%
2%
0%0 2 4 6 8 10 12 14 15
Week of Finishing PhaseWeek of Finishing Phase
K-STATE
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Effect of PCV2 Vaccination on TAverage Initial and Final Pig Weight - Trial 2
Initial lb D 105 Weight lbInitial, lb D 105 Weight, lb70
269 4
280P<.01
56.557.760
263 1
269.4
270
50
263.1
260
40 250
Control Vaccine Control Vaccine
K-STATE
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Economics: Mortality, growth rate, and feed efficiency improvements werefeed efficiency improvements were calculated to result in a benefit of $8.68per pig ($3 94 in Trial 1)per pig ($3.94 in Trial 1)
K-STATE
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The J Six AntibodyThe J-Six Antibody Trial
“Can we vaccinate pigs in the farrowing house at youngerfarrowing house at younger ages and will ½ dose of vaccine be equivalent to full d ?”dose?”
K-STATE/ /
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J-Six Antibody Trial
• Genetic Background: Triumph TR4 x PIC g pC22
• PRRS positive p
• Multi-site KS production system
K-STATE/ /
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J-Six Antibody TrialExperimental Design:p g•25 pigs per treatment 1 pig per litter for each treatment,•Bled at weaning, end of nursery and mid finishing Treatments:Control – No vaccinationYoung Full – 1 and 3 weeks of age and 2 x 2 ml doseYoung Full 1 and 3 weeks of age and 2 x 2 ml doseOld Full - 3 and 5 weeks and 2 x 2 mlYoung Half – 1 and 3 weeks and 2 x 1 mlOld Half – 3 and 5 weeks and 2 x 1 mlOld Half – 3 and 5 weeks and 2 x 1 ml
K-STATE/ /
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Geometric Mean Titer
1200
Pigs with < 320 at 3 weeks
800
10003 Week
9 Week
18 Week
600
800
Tite
r
18 Week
200
400
0
ll lf lYoung Old Young Old
Full Half Control
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Geometric Mean Titer
1200 3 Week
Pigs with > 320 at 3 weeks
800
10003 Week
9 Week
18 Week
600
800
Tite
r
200
400
0
Young Old Young OldFull Half Control
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Prevalence of Natural InfectionDefined as a rise in titer from the 9 to 18 week sample
60%
70%p
a,b P <0.05
35% 37%40%
50%
nce
a aa b35%
30%26%30%
40%
Prev
ale a,b
a,b
6%10%
20%b
0%Young Old Young Old
Full Half Control
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Tag 3 weeks 9 weeks 18 weeks
83 40 640 160
85 80 2561 640Passive maternal
85 80 2561 640
84 80 2561 640
100 80 1280 320
24 80 1280 320
88 160 1280 320
antibody interference with immunization? 88 160 1280 320
36 320 1280 640
93 320 2560 640
97 320
45 320 80 80
• Appears that pigs with ≤320 develop a post-vaccination
37 640 160 2561
94 640 160 2560
96 640 160 80
92 640 160 2561
p presponse
• Suggests antibody response 5 640 160 80
82 640 160 160
89 640 160 320
87 640 80 2561
gg y pis inhibited by antibody titer >320
86 640 80 2561
95 640
98 1280 160 80
90 1280 20 2561
91 2560 80 80
• Many new questions….
91 2560 80 80
18 2561 320 2561
99 320 80K-STATE/ /
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The Keesecker AgriThe Keesecker Agri Business Trial
“Are all PCV2 vaccines created equally?”created equally?
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KAB: comparative vaccine trial
• Treatments:− Unvaccinated Controls− Unvaccinated Controls
− One Dose PCV Chimera vaccine (Fort Dodge)
− Two Dose Baculovirus vectored vaccine d(Intervet)
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Background Information• Genetic Background: Triumph TR4 x PIC C22
• 1,470 Pigs randomly allotted to control or the two i t t tvaccine treatments
• Three different weaning groups
• Treatment pigs commingled within the same pens
• PCVD histopath lesions confirmed in each of the h ithree weaning groups
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Effect of PCV2 Vaccination on MortalityWeaning to Market
15
Weaning to Market
No significant differences
7 77 8
11.010, %
No significant differences
7.77.8
5orta
lity
5M
0
Control FortDodge Intervet
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Effect of PCV2 Vaccination on ADGWeaning to Day 143 after weaning (just prior to first pigs marketed)
1.7
g y g (j p p g )
a,b P <.05
b1.601.581.6
lb a
b b
1.53
1.5AD
G,
1.4
Control FortDodge Intervet
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Day 143 after Weaning Difference in Average Weight
15
Average Weight
10.27 6
10lb 7.6
5Wei
ght,
0.0
5W
0
Control FortDodge Intervet
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Market Weight HistogramDay 143 after weaning (just prior to first pigs marketed)
25
30Control Avg=237.3
1 Dose Avg=244 8
15
20
ency
1 Dose Avg=244.8
2 Dose Avg=247.4
10
15
Freq
u
0
5
0<140 160 180 200 220 240 260 280 300 320 >320
Weight Category, lb
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The Genetic Trial
“Do all genetic lines Crespond to PCV2 virus
and vaccination equally?”
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Clinical Signs and Background• Diagnosis of PCV2b infection in early ’06Diagnosis of PCV2b infection in early 06
based on histopathologic lesions and the presence of virus (IHC and PCR)
• Mortality was not the primary clinical sign
• Clinical manifestation was an increasing incidence of ill-thrift and stunted pigs
• Morbidity rather than mortality.
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Genetic by Vaccine Response Interaction Trial
Genetic background of the two lines:•A: Duroc-based line•B: Synthetic sire line
(Duroc, Pietran & Large White)
PRRS and Myco Negative Herd
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Experimental Plan
R d l ll l d i• Randomly allot to control and vaccinate balanced within genetic combination (AxA AxB BxA BxB)(AxA, AxB, BxA, BxB)
• Initially 454 pigs placed on-test
• Vaccine was administered at weaning and three weeks later – Intervet Vaccine
• Controls intermingled with vaccinates
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All t t t T t tAllotment to Treatment• Pigs were ranked by birth weight within litter and
gender
• Randomly assigned to control or vaccinate based on birth weight balanced across treatment
• Treatments:− Vaccine: Control or PCV2 Vaccine
− Genetic: AxA AxB BxA BxB
− Gender: Boar or Gilt
• Birth weight was balanced across vaccine treatment within each genetic combination
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Effect of PCV2 Vaccination and Genetic Line on Off Test Weight
235
250Control
Genetic Line on Off Test WeightTrt x Genetic P = .05
221227
221226
235
225lb
Vaccinate
201
Wei
ght,
l
200W
175
A X A AXB/BXA B X B/
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Effect of PCV2 Vaccination and Genetic Line on Fat Depth at Off Test
Control =11.3
Genetic Line on Fat Depth at Off TestTrt P=.13 Genetic P=.02 Trt x Genetic P = .46
12.112.011 712.0
14
m
Vaccinate =11.6
11.410.6
11.210.8
11.712.012
epth
, m
10
De
8
AxA AxB BxA BxBAxA AxB BxA BxB
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Effect of PCV2 Vaccination and Genetic Line on Fat Depth at Off Test
14Control =11.3
pAdjusted to a Common Off Test Weight
Trt P=.62 Genetic P=.002 Trt x Genetic P = .79
12.211.9
12.1
14
m
Vaccinate =11.6
10.711.111.9
10.711.211.612
epth
, mm
10
De
8
A A A B B A B BAxA AxB BxA BxB/ /K-STATE
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Effect of PCV2 Vaccination and Genetic Line on Loin Depth at Off Test
68 8 69 6
75Control =65.9
Genetic Line on Loin Depth at Off TestTrt P <.01 Genetic P <.01 Trt x Genetic P = .32
68.8
66.365.762 2
69.669.066.9
70
m
Vaccinate =66.9
59.2
62.2
60
65
epth
, m
55
De
50
AxA AxB BxA BxBAxA AxB BxA BxB
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Effect of PCV2 Vaccination and Genetic Line on Loin Depth at Off Test
75Control =65.6
Adjusted to a Common Off Test Weight
Trt P =.29 Genetic P <.01 Trt x Genetic P = .82
69.2
65.865.1
69.267.1
65.470
m
Vaccinate =66.0
62.3 62.6
60
65
pth,
mm
55
60
De
50
AxA AxB BxA BxBAxA AxB BxA BxB
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Effect of PCV2 Vaccination and Genetic Line on Wean to Finish ADG
2.00
Genetic Line on Wean to Finish ADG
Trt P <.01 Genetic P <.01 Trt x Genetic P = .04
1.711 681 75
Control
Vaccinate
1.44
1.601.631.631.591.631.68
1 50
1.75
AD
G, l
b
1.50A
1.25
AxA AxB BxA BxB
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Effect of PCV2 Vaccination and Genetic Line on Finisher ADG
2.25
Genetic Line on Finisher ADG
Trt P < .01 Genetic P = .03 Trt x Genetic P = .05
1.952.002.02
2 00
Control
Vaccinate
1.70
1.881.911.931.912.00
AD
G, l
b
1.75A
1.50
AxA AxB BxA BxB
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Off Test Weight Histogram – AxAg g
40%45%
Control Avg=201Vaccinate Avg=221
30%35%
cy
Vaccinate Avg=221
15%20%25%
Freq
uen
5%10%15%
0%<140 160 180 200 220 240 260 280 300 >300
Weight Category lbWeight Category, lb
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Off Test Weight Histogram – BxBg g
40%45%
Control Avg=221Vaccinate Avg=226
25%30%35%
ncy
g
15%20%25%
Freq
ue
0%5%
10%
0%<140 160 180 200 220 240 260 280 300 >300
Weight Category, lbg g y,
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Maternal Immunity
“What role does maternal immunity play in the vaccination of the young pig?”p g
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Maternal antibody impact on ivaccine response
• IFA antibody titers compared over time− Pre-vaccination at 21 days of agey g
− 60 day sample (~3 weeks after second vaccination)
− 150 day sample at off-test
• Field virus infections occurred early in controls in this farm
• Work is ongoing to relate QPCR to antibody to growth response
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Trial Tag Group
IFA Titer (3/15/07) (Bleed 1) IFA Titer (4/23/07) (Bleed 2) IFA Titer (7/23/07) (Bleed 3)
21 doa 60 doa 150 doa
492 Control <20 <20 >2560
499 Control <20 2560 >2560
502 Control <20 no 1280
148 Control 80 >2560 >2560
612 Control 80 >2560 >2560
615 Control 80 80 >2560615 Control 80 80 >2560
643 Control 80 <20 >2560
336 Control 160 >2560 >2560
478 Control 160 640 2560
567 Control 160 no >2560
640 Control 160 >2560 >2560
GMT 70 502 2404
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IFA Titer (3/15/07) (Bleed 1) IFA Titer (4/23/07) (Bleed 2) IFA Titer (7/23/07) (Bleed 3)
Trial Tag Group
( ) ( ) ( ) ( ) ( ) ( )
21 doa 60 doa 150 doa
129 Control 1280 320 >2560129 Control 80 3 0 560
168 Control 1280 640 2560
220 Control 1280 320 >2560
282 Control 1280 640 >2560282 Control 1280 640 >2560
283 Control 1280 320 >2560
293 Control 1280 640 >2560
548 Control 1280 160 >2560548 Control 1280 160 >2560
262 Control 2560 640 >2560
292 Control 2560 640 2560
324 C l 2560 1280 >2560324 Control 2560 1280 >2560
261 Control >2560 640 >2560
264 Control >2560 640 >2560
2560 2561 2560563 Control >2560 2561 >2560
1763 575 2561
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IFA Titer (3/15/07) (Bleed 1) IFA Titer (4/23/07) (Bleed 2) IFA Titer (7/23/07) (Bleed 3)
Trial Tag Group
21 doa 60 doa 150 doa
<20 >2560 320498 Vaccinate <20 >2560 320
500 Vaccinate <20 >2560 320
501 Vaccinate <20 >2560 1280
614 Vaccinate 80 >2560 2560
566 Vaccinate 160 2560 1280
613 Vaccinate 160 2560 1280
644 Vaccinate 160 >2560 640
58 >2560 861
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IFA Titer (3/15/07) (Bleed 1) IFA Titer (4/23/07) (Bleed 2) IFA Titer (7/23/07) (Bleed 3)
Now I am reduced to guessing – until PCR is complete
Trial Tag Group
IFA Titer (3/15/07) (Bleed 1) IFA Titer (4/23/07) (Bleed 2) IFA Titer (7/23/07) (Bleed 3)
21 doa 60 doa 150 doa
167 Vaccinate 1280 >2560 >2560
285 Vaccinate 1280 >2560 >2560
286 Vaccinate 1280 >2560 >2560
295 Vaccinate 1280 1280 >2560
320 Vaccinate 1280 2560 2560
325 Vaccinate 1280 >2560 2560
328 Vaccinate 1280 >2560 1280
551 Vaccinate 1280 1280 1280
588 Vaccinate 1280 160 320
166 Vaccinate 2560 2560 1280
553 Vaccinate 2560 >2560 >2560
554 Vaccinate 2560 1280 2560
265 Vaccinate >2560 640 2560
552 Vaccinate >2560 320 1280
1640 1413 1810
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M l ib d dMaternal antibody study-the RIGHT (aka Dritz) way
• Study begins next week
• “Does maternal antibody block benefits of vaccine for growth AND antibody production?”
• K-State & Arizona Pork Producers
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The B&K Livestock comparative vaccine & ib d i l& antibody trial
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Comparative trial, vaccine and dose• 620 weaned pigs from sow farm to off-site nursery finisherp g y
• History of severe PCV losses in previous groups
• 6 r p f 15 pi h l t d t r nd m f r• 6 groups of 15 pigs each selected at random for treatment, no non-vaccinated controls (welfare)− BI full dose, BI half dose groups
− Intervet full dose, Intervet half dose groups
− Ft Dodge full dose, half dose groups
• Sampled at 3, 5, 11 and 18 weeks of age
• Little wild-type virus present in this study
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Effect of PCV2 Vaccine and Time on IFA GMT (Bleed x Treatment)
2000Boehring FortDodg Intervet
( )Full and Half Dose Combined
Trt x Age P < .01
1069967
1500
T
g g
717
378 289
559 476300
783967
500
1000
GM
T
145289
46 620
3 5 11 233 5 11 23
Age, weeks
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Effect of PCV2 Vaccine and Time on IFA GMT (Bleed x Treatment)
2000 Boehring FortDodg Intervet
( )Full Dose
Trt x Age x Dose P = .21
1078
14901500
T
g g
875
302
649
272410
710
283383500
1000
GM
T
30243
27260
283
0
500
3 5 11 23
Age, weeks
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Effect of PCV2 Vaccine and Time on IFA GMT (Bleed x Treatment)
2000
( )Half Dose
Trt x Age x Dose P = .21
1500
2000Boehring FortDodg Intervet
867
588766
481
863591
1000
GM
T
70
481
48307349
64319
0
500
3 5 11 23
Age, weeks
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Intervet Vaccine - Effect of PCV2 Vaccine and Time on IFA GMT (Bleed x Treatment)
2000Full Half
Time on IFA GMT (Bleed x Treatment)Trt x Age x Dose P = .21
1490
1078867
1500
T
Full Half
875
302588
766867
500
1000
GM
T
70
0
3 5 11 233 5 11 23
Age, weeks
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Fort Dodge Vaccine - Effect of PCV2 Vaccine and Time on IFA GMT (Bleed x Treatment)
2000Full Half
Time on IFA GMT (Bleed x Treatment)Trt x Age x Dose P = .21
8631000
1500
MT
710
283383
863
319591
500
1000
GM
60 640
3 5 11 233 5 11 23
Age, weeks
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BI Vaccine - Effect of PCV2 Vaccine and Time on IFA GMT (Bleed x Treatment)
2000Full Half
Time on IFA GMT (Bleed x Treatment)Trt x Age x Dose P = .21
1500
T
Full Half
649
272410481
307349500
1000
GM
T
43272
480
3 5 11 233 5 11 23
Age, weeks
/ /K-STATE /
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Full Dose vs. Half Dose and TimingO Ob ti f th fi ldOur Observations from the field
• Full doses are absolutely recommended if possibley p− Demonstrated antibody response is better
− Clinically fewer lightweight pigs
Clinically fewer affected pigs than half dose− Clinically fewer affected pigs than half dose
• Maternal passive immunity inhibits antibody response to vaccineresponse to vaccine− The younger the pig, higher the passive antibody and less
likely to effectively immunize?
B i i b f i f d/ i i− But must immunize before infected/viremic
− Impact on performance trials to be done
• Two doses appear to produce a superior response• Two doses appear to produce a superior response over single dose
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Summary: antibody results and ti f f t hquestions for future research
• IFA has high correlation with SN
• Question of passive interference with immunization is not answered conclusivelyis not answered conclusively− Variation herd-to-herd and group-to-group− Why do some groups/pigs apparently fail?
Ti i i i d d ?− Timing vaccinations, repeated doses?
• New antibody tests being developed− Quantitative DIVA differential ELISAQuantitative DIVA, differential ELISA
• Essential for compliance, apparent failure and herd status/timing decisionsg
/ /K-STATE /
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NPBNPB The Mega StudyThe Mega Study
“This m lti instit tional“This multi-institutional research will develop much needed tools and build towards next generation circo virus vaccines.”vaccines.
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K-State, ISU, SDSU, NPB Collaboration
“PCVAD I d d I D f i ”“PCVAD Induced Immune Dysfunction”• To develop antibody tests that will differentiate viruses in an
infectionec o• To discriminate vaccine responses from field viruses• To quantitate the antibody response and define relevance
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M E iMore Experience From the FieldFrom the Field
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Placed since 7/1/06 - Mortality + Light-weight Culls (<225#) by placement date
30.0%
Red diamonds = "Single Dose Ft Dodge"Green diamonds = "Two Dose Intervet"
Blue diamonds = Non-vaccinates
25.0%
15.0%
20.0%
10.0%
0 0%
5.0%
0.0%
7/1/
067/
8/06
7/15
/06
7/22
/06
7/29
/06
8/5/
068/
12/0
68/
19/0
68/
26/0
69/
2/06
9/9/
069/
16/0
69/
23/0
69/
30/0
610
/7/0
610
/14/
0610
/21/
0610
/28/
0611
/4/0
611
/11/
0611
/18/
0611
/25/
0612
/2/0
612
/9/0
612
/16/
0612
/23/
0612
/30/
061/
6/07
1/13
/07
1/20
/07
1/27
/07
2/3/
072/
10/0
72/
17/0
72/
24/0
73/
3/07
3/10
/07
3/17
/07
3/24
/07
3/31
/07
4/7/
074/
14/0
74/
21/0
74/
28/0
75/
5/07
5/12
/07
5/19
/07
5/26
/07
6/2/
076/
9/07
6/16
/07
6/23
/07
6/30
/07
7/7/
077/
14/0
77/
21/0
77/
28/0
7
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Conclusions:
• Circovirus disease, with the immunologic and growth impacts, has changed our view of population health
• Immunization success, and vaccine product diversity, is a wonderful beginning for disease managementmanagement
• Many questions are yet to be addressed, including possibilities for elimination from populations
• Collaborative research efforts are critical to future progress
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What lies ahead ?
• Vaccine − next generation vaccines?
− Effect over time and the emergence of new “strains”?
• Maximizing benefit – the growth effect of PCV; can we immunize all animals?
• Sows and gilts – what to do and what not?
• Needed tools• Needed tools− KSU research, others
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Thanks to our ever-growing team!
Suther Farms
HENRYSLIMITED
K-STATE
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W ’We’ve come a LONG
iway in a year!year!
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It’s nice to see healthy pigs again.
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Thanks to everyone for all their support
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Thanks to our team for a slam dunk!
Any questions?