thein shwe, mph, ms, mbbs vpd & ibd epidemiologist hot topics training 11/17/2010 division of...
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Thein Shwe, MPH, MS, MBBSVPD & IBD Epidemiologist
Hot Topics Training11/17/2010
Division of Infectious Disease EpidemiologyOffice of Epidemiology & Prevention Services
Bureau for Public HealthWest Virginia Dept. of Health & Human Resources
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Objectives To describe clinical description, diagnosis and
epidemiology of pertussis
To understand Investigation of a case of pertussis and outbreak of
pertussis
To review a pertussis case study
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Disease DescriptionPertussis, a cough illness commonly known as whooping
cough (100 Day Cough), is caused by the bacterium Bordetella pertussis.
Prolonged paroxysmal cough often accompanied by an inspiratory whoop.
Varies with age and history of previous exposure or vaccination.
Neither infection nor immunization provides lifelong immunity
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Other Bordetella speciesThree other Bordetella species:
B. parapertussis, B. holmesii, and B. bronchiseptica.
B. pertussis and B. parapertussis coinfection is not unusual.
Disease with Bordetella species other than B. pertussis is not reportable.
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Clinical Description of Pertussis
StagesStages
(6-10 wks.)(6-10 wks.)
CatarrhalCatarrhal
(1-3 wks.)(1-3 wks.)
ParoxysmalParoxysmal
(1-2 wks.)(1-2 wks.)
ConvalescentConvalescent
(up to 3 mths.)(up to 3 mths.)
SymptomsSymptoms mild URT mild URT symptoms, symptoms, intermittent intermittent dry coughdry cough
coughing coughing spasmsspasmsinspiratory inspiratory whoop whoop Post-tussive Post-tussive vomitingvomiting
Infants <6 Infants <6 mths. mths.
Gagging, Gagging, gasping or gasping or apneaapnea
No whoopNo whoop ProlongedProlonged
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SOUND OF PERTUSSIS
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Epidemiology of Pertussis
Mode of transmission
Person to person viaAerosolized droplets from cough or sneezeDirect contact with secretions from respiratory tract of
infectious person
80% - secondary attack rate
Older children and adults are important sources of disease for infants and young children
Infants <12 months of age greatest risk for complications and death
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Epidemiology of Pertussis cont.
Reservoir - HumansIncubation period: 7-10 days (5-21 days).Infectious period: Most contagious during the
catarrhal stage (3 weeks before cough) and the first 2 weeks after cough onsetcough onset
Duration of illness:Children: 6-10 wks.~ ½ of Adolescents: 10 wks or longer
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Pertussis ComplicationsSyncope (temporary loss of consciousness/faint)Sleep disturbanceIncontinenceRib fracturesComplications among infants
Pneumonia (22%)Seizures (2%)Encephalopathy (<0.5%)
DeathInfants, particularly those who have not received a primary
vaccination series, are at risk for complications and mortality.
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Pertussis Laboratory Diagnosis
WV OLS offers pertussis PCR and Culture for free of charge
304-558-3530
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Pertussis Laboratory TestingCulture PCR DFA Serology
Specimen NP Swabs or aspirates
NP Swabs or aspirates
NP Swab Blood
Advantages •Gold standard•100% Specific
Results available quickly
Rapid results
Disadvantages •Relatively insensitive•Difficult to isolate•Most successful during the catarrhal stage•Takes 7-10 days to get the result
•Sensitivity & specificity varies
•Calcium alginate swabs cannot be used to collect NP swabs for PCR
•Not confirmatory
•No use for surveillance
•No standardized test available
•No use for Surveillance
Comments Use with culture Use with culture and/or PCR
Use with culture and/or PCR
NP swab=nasopharyngeal swabs, PCR-Polymerase chain reaction, DFA-direct florescent antibody
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Proper Technique for Obtaining a Nasopharyngeal Specimen for Isolation of B pertussis
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http://www.nejm.org/doi/full/10.1056/NEJMe0903992
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& Outbreak Investigation
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CDC/CSTE (2010)http://www.cdc.gov/ncphi/disss/nndss/casedef/pertussis_current.htm
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Pertussis Probable Case Definition
- In the absence of a more likely diagnosis, a cough illness lasting ≥2 weeks, with at least one of the following symptoms: paroxysms of coughing; OR inspiratory "whoop”; OR post-tussive vomiting; AND
absence of laboratory confirmation; AND no epidemiologic linkage to a laboratory-
confirmed (PCR or culture) case of pertussis
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Pertussis Confirmed Case Definition
Option 1 Acute cough illness of any duration with isolation (culture) of B. pertussis from a clinical specimen
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Pertussis Confirmed Case DefinitionOption 2
Cough illness lasting ≥2 weeks, with at least one of the following symptoms:
paroxysms of coughing; inspiratory "whoop"; or post-tussive vomiting
AND
polymerase chain reaction (PCR) positive for pertussis;
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Pertussis Confirmed Case Definition
Option 3Illness lasting ≥2 weeks, with at least one of the
following symptoms:
paroxysms of coughing; inspiratory "whoop"; or post-tussive vomiting;
AND, contact with a laboratory-confirmed (PCR or culture) case of pertussis.
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PERTUSSIS CASE INVESTIGATION
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Importance of Rapid Case Identification
Early diagnosis and treatment to limit disease spread
Identify and provide prophylaxis to close contacts pending laboratory confirmation
When suspicion of pertussis is low, investigation
can be delayed pending laboratory confirmation Exception: prophylaxis of infants and their household
contacts should NOT be delayed
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What is the next step in a case investigation?
Refer to Pertussis Protocol
Use Pertussis WVEDSS form
Begin your case ascertainment
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Resources Needed for Case Investigation
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Resources Needed for Case Investigation cont.
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Resources Needed for Case Investigation cont.
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Resources Needed for Case Investigation cont.
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How do you ascertain a case?
Three pieces of information needed to determine if you have a pertussis case
1. Clinical information
2. Laboratory report(s)
3. Epidemiological information
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Verify the diagnosis
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Epidemiologic Information
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Management of Close Contact(s)
Identify close contactsPrevent secondary transmissionCollect nasopharyngeal swab (if not done so) for PCR
and culture testing at OLSTreat the patient with recommended antibioticsIsolate the patient for 5 days (after the beginning of
antibiotics) or 21 days (if no A/b treatment received)
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Contact TracingClose contact definition
Direct face-to-face contact for a period (not defined) with a case-patient who is symptomatic during the catarrhal and early paroxysmal stages of infection. All residents of the same household; Daycare and baby-sitting contacts; and Close friends, regardless of immunization
status.
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Contact TracingClose contact definition (cont.)
Shared confined space in close proximity for a prolonged period of time, such as >1 hours, with a symptomatic case-patient: or
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Contact TracingClose contact definition (cont.)
Direct contact with respiratory, oral, or nasal secretions from a symptomatic case-patient – example:an explosive cough or sneeze in the face, sharing food, sharing eating utensils during a
meal, kissing, mouth-to mouth resuscitation, or performing s full medical exam including
examination of the nose and throat.
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Contact Tracing of a Pertussis Case
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Management for Exposed persons
Type of ContactType of Contact Evaluate Evaluate & Lab & Lab
VaccinateVaccinate Prophylaxis/Prophylaxis/
treatmenttreatment
AsymptomaticAsymptomatic
Within 3 weeksWithin 3 weeks
NoNo YesYes YesYes
AsymptomaticAsymptomatic
> 3 weeks> 3 weeks
NoNo YesYes Consider for Consider for households with high-households with high-risk contacts (infants, risk contacts (infants, pregnant women, pregnant women, people who have people who have contact with infants)contact with infants)
SymptomaticSymptomatic YesYes
Collect Collect NP NP swabswab
YesYes YesYes
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Postexposure Prophylaxis for Pertussis in Infants, Children, Adolescents, and Adults
Source: Red Book 2009 AAP – pg. 507
Age Azithromycin(Recommended)
ErythromycinRecommended
Clarithromycin(Recommended)
TMP-SMX(alternative)
<1mo 10mg/kg/day as a single dose for 5 days
40mg/kg/day in 4 divided dosesx14days
Not recommended CI at <2 mo of age
1-5 mo See above See above 15mg/kg/day in 2 divided doses x 7 days
≥2mo of age:TMP,8mg/kg/day;SMX,40mg/kg/day in 2 doses x 14 days
≥6 mo or older & children
10mg/kg/day as a single dose on day 1(maximum 500 mg); then 5 mg/kg/day as a single dose on days 2-5(maximum 250 mg/day)
40 mg/kg/day in 4 divided doses for 14 days (maximum 2g/day)
15mg/kg/day in 2 divided doses x 7 days(maximum 1 g/day)
See above
Adolescents & adults
500 mg as a single dose on day 1, then 250 mg as a single dose on days 2-5
2g/day in 4 divided doses for 14 days
1g/day in 2 divided doses for 7 days
TMP, 200 mg/day; SMX,1600 mg/day in 2 divided doses x 14 days
TMP- trimethoprin; SMX-sulfamethoxazole; CI - contraindication36
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Once the investigation is completed..
Document public health action Check case classification Print the report for your files or per your
LHD policy & procedure Send lab report(s) to DIDE Submit completed WVEDSS report
electronically to your regional epidemiologist and DIDE
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Pertussis Outbreak Case Definition
Outbreak is defined as: Two or more cases Involving two or more households Clustered in time & space AND One case must be confirmed by
positive culture
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Pertussis Outbreak Line List Formhttp://www.wvidep.org/Portals/31/PDFs/IDEP/Pertussis/Pertussis%20Outbreak%20Linelisting
%20Form.pdf
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Outbreak Notification and Control
Notify your regional epidemiologist & DIDE immediately
Evaluate case status & manage close contacts
Obtain nasopharyngeal swabs for culture (confirmation) and PCR
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Outbreak Control in Any Settings
Treat/Prophylax with recommended antibiotic
Isolate 5 days after starting antibiotic treatment or 21 days from cough onset if no treatment
Bring immunizations up-to-dateAccelerated vaccination if cases are occurring young
infants
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Alert your providers and notify the parents…
Healthcare ProvidersSend Health alert letterProvider information sheet
Parent/GuardianSend notification letterPublic information sheet
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Exposures in Child CareExposed Children (especially incompletely
immunized) and childcare providers should beObserved for respiratory tract symptoms for 21 days
after contact with an infectious person has been terminated
Administer vaccine and antibiotics Exclude:
Symptomatic or confirmed pertussis until completion of 5 days of the recommended course of antimicrobial therapy or 21 days if untreated
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Follow up & ReportCheck the status of the outbreak control
Document and update your regional epidemiologist and DIDE when the outbreak is controlled completely
Forward report with lab results to DIDE
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Case StudyOn November 1, 2010, an Infection Preventionist (IP) of
CAMC called your health department to notify you about two 6-month old twins who presented to the ED with cough for 10 days since 10/22/10, apnea and paroxysmal cough, the labs are pending at this time, the ER doctor had high suspicion of pertussis,both babies were admitted to CAMC, andtreated with Azithromycin 10mg/kg/day for 5 days.
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What would you do as soon as you receive a call like this?
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What Information would you collect for contact tracing?
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Contact Tracing Information Six household members and a baby sitter were exposed to these twins
during the infectious period. A baby sitter and 5 of 6 household members have been coughing:
Amy, mother, 30 yo, cough started on 10/23, no vaccine Bob, father, 32 yo, cough started on 10/24, vaccine yes, # of dose -UK Ann, grandma, 67 yo, cough started on 10/16, no vaccine John, brother, 9 yo, no cough, had 4 doses of PCV Julie, sister, 6 yo, cough started on 10/22, had 4 doses of PCV Brad, brother, 4 yo, cough started on 10/24, had 4 doses of PCV Katie, baby sitter, 19 yo, cough started on 10/10, had 3 doses of PCV
3 siblings attend the same elementary school and have been attending school while coughing.
No lab done yet on any symptomatic cases as of 11/1/10None of them has received PEP yet as of 11/1/10
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What is your next step at this time?
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Do you have an outbreak at this time and why?
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On 11/2/10 and 11/8/10Lab results were faxed to your HD:
Name Specimen Source/Date
Type of Test Result Reference
Kevin Smith
NP swab11/1/10
DNA/PCRB pertussis B parapertussis
DetectedNot detected
Not detectedNot detected
Kevin Smith
NP swab11/1/10
CultureB pertussis B parapertussis
Not isolatedNot isolated
Not isolatedNot isolated
Marvin Smith
NP swab11/1/10
DNA/PCRB pertussis B parapertussis
DetectedNot detected
Not detectedNot detected
Marvin Smith
NP swab11/1/10
CultureB pertussis B parapertussis
IsolatedNot isolated
Not isolatedNot isolated
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Information about Close Contacts
All close contacts received PEP.
Nasopharyngeal swabs have been taken from all symptomatic contacts for lab confirmation and all were negative for B. pertussis for PCR and culture.
All symptomatic contacts had at least two weeks of cough.
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Case Ascertainment of Close Contacts
Name Clinical Criteria
Lab Criteria
Epi-linked Case Status?
Amy met negative yes
Bob Not met Negative yes
Ann Met Negative yes
John Met Negative Yes
Julie Met Negative Yes
Brad Not met Not done
Katie Yes Negative Yes
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Do you have an outbreak at this time and why?
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What is your next step at this time?
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SummaryDisease description including clinical characteristics,
laboratory diagnosis and epidemiology
Pertussis case investigation and outbreak investigationCase study
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Resources IDEP Pertussis site:http://www.wvdhhr.org/idep/a-z/a-z-pertussis.asp CDC Pertussis Surveillance Investigation:
http://www.cdc.gov/nip/publications/sur-manual/chpt08_pertussis.pdf
Guideline for Control of Pertussis Outbreak:http://www.cdc.gov/nip/publications/pertussis/gui
de.htm
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References
CDC VPD Surveillance Manual, 4th Edition, 2008 Pertussis: Chapter 10
Pertussis (Whooping Cough) Pg. 504-519, Red Book, 2009 Report of the Committee on Infectious Diseases – American Academy of Pediatrics, 28th Edition
http://www.cdc.gov/vaccines/recs/schedules/adult-schedule.htm
Pertussis Pg. 455-461, Control of Communicable Diseases Manual, APHA & WHO, 19th Edition, David Heymann, MD, Editor
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Questions?
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