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•Family Picornaviridae
•Non-enveloped
•Icosahedral
Hepatitis A Virus (HAV)
Genome Replication
• HAV can not be propagated in the laboratory
as readily as other enteroviruses
• The virus interacts with receptors expressed
on liver cells
• Is not cytolytic and is released from liver cells
by exocytosis.
HAV : Properties of Virion
Resistance
HAV is resistant to
• Detergents
• Acids
• Temperature up to 60o
C
• Can survive for many months in
fresh and salt water
HAV : Properties of Virion
Routes of Transmission
Main Route : fecal-oral
• The virus is excreted into stool in high concentrations
• Spreads by:
° Contaminated water & food
° Dirty hands
Other Routes
• Transfusion of blood and blood products during viremia
• I.V drug abuse
HAV : Epidemiology
Transmission
• Most infected people are contagious before symptoms
• Outbreaks usually originate from a common source like:
° Water supply
° Restaurant
° Daycare units
• Higher incidence of HAV infection is directly related to:
° Poor hygienic conditions &
° Over-crowding.
HAV : Epidemiology
Seroprevalence
•Mostly children are infected
•Have mild illness
•Develop lifelong immune protection
against re-infection
HAV : Epidemiology
HAV : Clinical Features
Incubation period
• Between 3-5 weeks
Clinical features
• Many infections are asymptomatic
• Initial symptoms include fever, fatigue, nausea,
loss of appetite and abdominal pain
• Jaundice is common
• HAV is nearly always self limiting
• Complications such as fulminant hepatitis are rare
• Mortality : about 1/1000
HAV : Diagnosis
• Clinical symptoms
• The identification of a known infected source
• Immune electron microscopy for HAV feces
• HAV IgM & IgG measured by ELISA or RIA
• Clinical symptoms
• The identification of a known infected source
• Immune electron microscopy for HAV feces
• HAV IgM & IgG measured by ELISA or RIA
HAV : Prevention and control
• Proper hygienic measures
IMMUNIZATION
A. Passive immunization
• Immunoglobulins : Given before or shortly after exposure
• Can prevent infection in the next 3-6 months
B. Active immunization with
Hepatitis A vaccine
• There is only one serotype of HAV
• A killed HAV vaccine is available
 Routine hepatitis A vaccination for children aged 12 to 23
months and for adults who are at high risk for infection.
Hepatitis E Virus (HEV)
Taxonomy and structure
• Belongs to family Caliciviridae.
Epidemiology and control
• World-wide distribution
• Predominantly spreads by fecal-oral route
• Especially through contaminated water
HEV : Pathogenesis &
Clinical Syndromes
• Are similar to that of HAV
• Causes only acute disease
• Incubation period is longer
• HEV infection is specially serious in
pregnant women with a mortality rate of 20%
Hepatitis G Virus (HGV)
• Resembles HCV in many aspects
• Belongs to the family Flaviviridae
• Probably has a predilection for chronic disease
• So far, HGV infection can only be diagnosed
by detection of genome by PCR.

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Lecture 8a - HAV-HEV-HGV-RMC

  • 2. Genome Replication • HAV can not be propagated in the laboratory as readily as other enteroviruses • The virus interacts with receptors expressed on liver cells • Is not cytolytic and is released from liver cells by exocytosis. HAV : Properties of Virion
  • 3. Resistance HAV is resistant to • Detergents • Acids • Temperature up to 60o C • Can survive for many months in fresh and salt water HAV : Properties of Virion
  • 4. Routes of Transmission Main Route : fecal-oral • The virus is excreted into stool in high concentrations • Spreads by: ° Contaminated water & food ° Dirty hands Other Routes • Transfusion of blood and blood products during viremia • I.V drug abuse HAV : Epidemiology
  • 5. Transmission • Most infected people are contagious before symptoms • Outbreaks usually originate from a common source like: ° Water supply ° Restaurant ° Daycare units • Higher incidence of HAV infection is directly related to: ° Poor hygienic conditions & ° Over-crowding. HAV : Epidemiology
  • 6. Seroprevalence •Mostly children are infected •Have mild illness •Develop lifelong immune protection against re-infection HAV : Epidemiology
  • 7.
  • 8. HAV : Clinical Features Incubation period • Between 3-5 weeks Clinical features • Many infections are asymptomatic • Initial symptoms include fever, fatigue, nausea, loss of appetite and abdominal pain • Jaundice is common • HAV is nearly always self limiting • Complications such as fulminant hepatitis are rare • Mortality : about 1/1000
  • 9.
  • 10. HAV : Diagnosis • Clinical symptoms • The identification of a known infected source • Immune electron microscopy for HAV feces • HAV IgM & IgG measured by ELISA or RIA • Clinical symptoms • The identification of a known infected source • Immune electron microscopy for HAV feces • HAV IgM & IgG measured by ELISA or RIA
  • 11. HAV : Prevention and control • Proper hygienic measures IMMUNIZATION A. Passive immunization • Immunoglobulins : Given before or shortly after exposure • Can prevent infection in the next 3-6 months B. Active immunization with Hepatitis A vaccine • There is only one serotype of HAV • A killed HAV vaccine is available  Routine hepatitis A vaccination for children aged 12 to 23 months and for adults who are at high risk for infection.
  • 12. Hepatitis E Virus (HEV) Taxonomy and structure • Belongs to family Caliciviridae. Epidemiology and control • World-wide distribution • Predominantly spreads by fecal-oral route • Especially through contaminated water
  • 13.
  • 14.
  • 15. HEV : Pathogenesis & Clinical Syndromes • Are similar to that of HAV • Causes only acute disease • Incubation period is longer • HEV infection is specially serious in pregnant women with a mortality rate of 20%
  • 16. Hepatitis G Virus (HGV) • Resembles HCV in many aspects • Belongs to the family Flaviviridae • Probably has a predilection for chronic disease • So far, HGV infection can only be diagnosed by detection of genome by PCR.