ser hepatitis
DESCRIPTION
hepatitisTRANSCRIPT
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Hepatitis A-E Viruses
An Overview
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AA“ Infectious”
“ Serum”
Viral hepatitis
Entericallytransmitted
ParenterallytransmittedF, G, TTV
? other
EE
NANBNANB
BB DD CC
Viral Hepatitis - Historical Perspectives
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Source ofvirus
feces blood/blood-derived
body fluids
blood/blood-derived
body fluids
blood/blood-derived
body fluids
feces
Route oftransmission
fecal-oral percutaneouspermucosal
percutaneouspermucosal
percutaneouspermucosal
fecal-oral
Chronicinfection
no yes yes yes no
Prevention pre/post-exposure
immunization
pre/post-exposure
immunization
blood donorscreening;
risk behaviormodification
pre/post-exposure
immunization;risk behaviormodification
ensure safedrinking
water
Type of HepatitisA B C D E
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Hepatitis A Virus
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Incubation period: Average 30 days
Range 15-50 days Jaundice by <6 yrs, <10%
age group: 6-14 yrs, 40%-50%
>14 yrs, 70%-80%
Complications: Fulminant hepatitisCholestatic
hepatitisRelapsing
hepatitis Chronic sequelae: None
Hepatitis A - Clinical Features
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FecalHAV
Symptoms
0 1 2 3 4 5 6 12
24
Hepatitis A Infection
Total anti-HAV
Titre ALT
IgM anti-HAV
Months after exposure
Typical Serological Course
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Close personal contact
(e.g., household contact, sex contact, child day care centers)
Contaminated food, water(e.g., infected food handlers, raw shellfish)
Blood exposure (rare)(e.g., injecting drug use, transfusion)
Hepatitis A Virus Transmission
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EndemicityDisease
RatePeak Age
of Infection Transmission Patterns
High Low to High
Early childhood
Person to person;outbreaks uncommon
Moderate High Late childhood/
young adults
Person to person;food and waterborne outbreaks
Low Low Young adults Person to person;food and waterborne outbreaks
Very low Very low Adults Travelers; outbreaks uncommon
Global Patterns of Hepatitis A Virus Transmission
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Laboratory Diagnosis
Acute infection is diagnosed by the detection of HAV-IgM in serum by EIA.
Past Infection i.e. immunity is determined by the detection of HAV-IgG by EIA.
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Many cases occur in community-wide outbreaks no risk factor identified for most cases highest attack rates in 5-14 year olds children serve as reservoir of infection
Persons at increased risk of infection travelers homosexual men injecting drug users
Hepatitis A Vaccination
StrategiesEpidemiologic Considerations
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Pre-exposure travelers to intermediate and high
HAV-endemic regions Post-exposure (within 14 days)
Routine household and other intimate contactsSelected situations institutions (e.g., day care centers) common source exposure (e.g., food prepared by
infected food handler)
Hepatitis A Prevention - Immune Globulin
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Hepatitis B Virus
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Incubation period: Average 60-90 daysRange 45-180 days
Clinical illness (jaundice): <5 yrs, <10%5 yrs, 30%-50%
Acute case-fatality rate: 0.5%-1% Chronic infection: <5 yrs, 30%-90%
5 yrs, 2%-10% Premature mortality from
chronic liver disease: 15%-25%
Hepatitis B - Clinical Features
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Spectrum of Chronic Hepatitis B Diseases
1. Chronic Persistent Hepatitis - asymptomatic
2. Chronic Active Hepatitis - symptomatic exacerbations of hepatitis
3. Cirrhosis of Liver
4. Hepatocellular Carcinoma
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Symptoms
HBeAg anti-HBe
Total anti-HBc
IgM anti-HBc anti-HBsHBsAg
0 4 8 12 16 20 24 28 32 36 52 100
Acute Hepatitis B Virus Infection with RecoveryTypical Serologic
Course
Weeks after Exposure
Titre
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IgM anti-HBc
Total anti-HBc
HBsAg
Acute(6 months)
HBeAg
Chronic(Years)
anti-HBe
0 4 8 12 16 20 24 28 32 36 52 Years
Weeks after Exposure
Titre
Progression to Chronic Hepatitis B Virus Infection Typical Serologic
Course
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Symptomatic Infection
Chronic Infection
Age at Infection
Chronic Infection (%)
Sym
pto
matic In
fection
(%)
Birth 1-6 months 7-12 months 1-4 years Older Childrenand Adults
0
20
40
60
80
100100
80
60
40
20
0
Outcome of Hepatitis B Virus Infection
by Age at Infection
Ch
ron
ic In
fect
ion
(%
)
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High (>8%): 45% of global population lifetime risk of infection >60% early childhood infections common
Intermediate (2%-7%): 43% of global population lifetime risk of infection 20%-60% infections occur in all age groups
Low (<2%): 12% of global population lifetime risk of infection <20% most infections occur in adult risk groups
Global Patterns of Chronic HBV Infection
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High ModerateLow/Not
Detectable
blood semen urineserum vaginal fluid feces
wound exudates saliva sweat
tearsbreastmilk
Concentration of Hepatitis B Virus in Various Body Fluids
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Sexual - sex workers and homosexuals are particular at risk.
Parenteral - IVDA, Health Workers are at increased risk.
Perinatal - Mothers who are HBeAg positive are much more likely to transmit to their offspring than those who are not. Perinatal transmission is the main means of transmission in high prevalence populations.
Hepatitis B Virus
Modes of Transmission
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Diagnosis A battery of serological tests are used for the diagnosis of acute and
chronic hepatitis B infection. HBsAg - used as a general marker of infection. HBsAb - used to document recovery and/or immunity to HBV
infection. anti-HBc IgM - marker of acute infection. anti-HBcIgG - past or chronic infection. HBeAg - indicates active replication of virus and therefore
infectiveness. Anti-Hbe - virus no longer replicating. However, the patient can still
be positive for HBsAg which is made by integrated HBV. HBV-DNA - indicates active replication of virus, more accurate than
HBeAg especially in cases of escape mutants. Used mainly for monitoring response to therapy.
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Treatment Interferon - for HBeAg +ve carriers with chronic active
hepatitis. Response rate is 30 to 40%. Lamivudine - a nucleoside analogue reverse transcriptase
inhibitor. Well tolerated, most patients will respond favorably. However, tendency to relapse on cessation of treatment. Another problem is the rapid emergence of drug resistance.
Successful response to treatment will result in the disappearance of HBsAg, HBV-DNA, and seroconversion to HBeAg.
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Prevention Vaccination - highly effective recombinant vaccines are now
available. Vaccine can be given to those who are at increased risk of HBV infection such as health care workers. It is also given routinely to neonates as universal vaccination in many countries.
Hepatitis B Immunoglobulin - HBIG may be used to protect persons who are exposed to hepatitis B. It is particular efficacious within 48 hours of the incident. It may also be given to neonates who are at increased risk of contracting hepatitis B i.e. whose mothers are HBsAg and HBeAg positive.
Other measures - screening of blood donors, blood and body fluid precautions.
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hypervariableregion
capsid envelope
protein
protease/helicase
RNA-dependent
RNA polymerase
c22
5’
core
E1 E2 NS2
NS3
33c
NS4
c-100
NS5
3’
Hepatitis C Virus
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Incubation period: Average 6-7
wksRange 2-26 wks
Clinical illness (jaundice): 30-40% (20-30%)
Chronic hepatitis: 70%
Persistent infection: 85-100%
Immunity: No protective antibody
response identified
Hepatitis C - Clinical Features
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Chronic Hepatitis C Infection
The spectrum of chronic hepatitis C infection is essentially the same as chronic hepatitis B infection.
All the manifestations of chronic hepatitis B infection may be seen, albeit with a lower frequency i.e. chronic persistent hepatitis, chronic active hepatitis, cirrhosis, and hepatocellular carcinoma.
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Symptoms
anti-HCV
ALT
Normal
0 1 2 3 4 5 6 1 2 3 4
Hepatitis C Virus InfectionTypical Serologic Course
Titre
Months
Years
Time after Exposure
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Transfusion or transplant from infected donor
Injecting drug use
Hemodialysis (yrs on treatment)
Accidental injuries with needles/sharps
Sexual/household exposure to anti-HCV-positive contact
Multiple sex partners
Birth to HCV-infected mother
Risk Factors Associated with
Transmission of HCV
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Laboratory Diagnosis HCV antibody - generally used to diagnose hepatitis C
infection. Not useful in the acute phase as it takes at least 4 weeks after infection before antibody appears.
HCV-RNA - various techniques are available e.g. PCR and branched DNA. May be used to diagnose HCV infection in the acute phase. However, its main use is in monitoring the response to antiviral therapy.
HCV-antigen - an EIA for HCV antigen is available. It is used in the same capacity as HCV-RNA tests but is much easier to carry out.
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Treatment
Interferon - may be considered for patients with chronic active hepatitis. The response rate is around 50% but 50% of responders will relapse upon withdrawal of treatment.
Ribavirin - there is less experience with ribavirin than interferon. However, recent studies suggest that a combination of interferon and ribavirin is more effective than interferon alone.
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Screening of blood, organ, tissue donors
High-risk behavior modification
Blood and body fluid precautions
Prevention of Hepatitis C
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HBsAg
RNA
antigen
Hepatitis D (Delta) Virus
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Coinfection– severe acute disease.– low risk of chronic infection.
Superinfection– usually develop chronic HDV infection.– high risk of severe chronic liver disease.– may present as an acute hepatitis.
Hepatitis D - Clinical Features
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Percutanous exposures
injecting drug use
Permucosal exposuressex contact
Hepatitis D Virus Modes of Transmission
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anti-HBs
Symptoms
ALT Elevated
Total anti-HDV
IgM anti-HDV
HDV RNA
HBsAg
HBV - HDV CoinfectionTypical Serologic Course
Time after Exposure
Titre
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anti-HBs
Symptoms
ALT Elevated
Total anti-HDV
IgM anti-HDV
HDV RNA
HBsAg
HBV - HDV CoinfectionTypical Serologic Course
Time after Exposure
Titre
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Jaundice
Symptoms
ALTTotal anti-HDV
IgM anti-HDV
HDV RNA
HBsAg
HBV - HDV SuperinfectionTypical Serologic
Course
Time after Exposure
Titre
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HBV-HDV Coinfection
Pre or postexposure prophylaxis to prevent HBV infection.
HBV-HDV Superinfection
Education to reduce risk behaviors among persons with chronic HBV infection.
Hepatitis D - Prevention
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Hepatitis E Virus
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Incubation period: Average 40 days
Range 15-60 days Case-fatality rate: Overall, 1%-3%
Pregnant women, 15%-25%
Illness severity: Increased with age
Chronic sequelae: None identified
Hepatitis E - Clinical Features
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Symptoms
ALT IgG anti-HEV
IgM anti-HEV
Virus in stool
0 1 2 3 4 5 6 7 8 9 10
11
12
13
Hepatitis E Virus InfectionTypical Serologic
Course
Titer
Weeks after Exposure
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Most outbreaks associated with faecally contaminated drinking water.
Several other large epidemics have occurred since in the Indian subcontinent and the USSR, China, Africa and Mexico.
In the United States and other nonendemic areas, where outbreaks of hepatitis E have not been documented to occur, a low prevalence of anti-HEV (<2%) has been found in healthy populations. The source of infection for these persons is unknown.
Minimal person-to-person transmission.
Hepatitis E - Epidemiologic
Features
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Avoid drinking water (and beverages with ice) of unknown purity, uncooked shellfish, and uncooked fruit/vegetables not peeled or prepared by traveler.
IG prepared from donors in Western countries does not prevent infection.
Unknown efficacy of IG prepared from donors in endemic areas.
Vaccine?
Prevention and Control Measures for Travelers to HEV-Endemic Regions