Hepatitis A virus Flashcards

1
Q

Hepatitis A virus

A

Picornaviridare “ Infection hepatitis”

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2
Q

Hepatitis B virus

A

Hepadnaviridae “Serum Hepatitis”

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3
Q

Hepatitis C Virus

A

Flaviridae “Serum Heptatitis”

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4
Q

Hepatitis D virus

A

Satellite, co-infect with HBV

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5
Q

Hepatitis E virus

A

no family established, “infections hepatitis”

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6
Q

Hepatitis F and G

A

no family established; Flaviviridae

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7
Q

Primary causes of Chronic liver disease

A

Hepatitis C; Alcohol; Hepatitis C + Alcohol; Unknown;

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8
Q

Hepatitis A, acute or chronic

A
  • acute infection, not chronic

- most common vaccine preventable diseases in the world

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9
Q

Genome of Hepatitis A

A
  • Single stranded
  • Positive
  • RNA
  • viral protein on the 5’ end
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10
Q

Capsid structure of Hepatitis A

A
  • icosahedral

- 4 viral polypeptides(VP1-VP4)

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11
Q

Envelope of Hepatitis A

A

-does not contain one

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12
Q

Family of Hepatitis A

A

Picornavirus

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13
Q

Hepatitis A is stable in what kind of conditions?

A
  • acid at pH 1
  • solvents
  • detergents
  • salt water, groundwater(months)
  • drying
  • cold(3C) and high(61C) temperature
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14
Q

Inactivation of Hepatitis A by?

A
  • chlorine treatment
  • Formalin
  • Peracetic acid
  • Beta propiolactone
  • UV
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15
Q

Replication process of Hepatitis A

A
  1. Receptor binding
  2. RNA uncoating
  3. Translation and proteolytic processing
  4. RNA processing
  5. Virion assembly
  6. Maturation and release
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16
Q

Incubation of Acute Hepatitis

A

-period is 2 to 6 weeks, mean of 4 wks

17
Q

Prodrome phase of Acute hepatitis

A
  • mild flu like
  • anorexia, nausea, vomiting
  • fatigue, malaise, myalgia, headache
  • low grade fever
18
Q

Icteric phase of Acute hepatitis

A
  • dark urine; pale stool
  • jaundice
  • abdominal pain
  • itch(pruritus)
19
Q

Recovery of acute hepatitis

A
  • symptoms generally wane during jaundice period

- complete recovery 99% of the time

20
Q

Physical appearance of jaundice

A
  • aka Icterus

- yellowing of skin, conjunctiva, mucous membrane

21
Q

Cause of jaundice

A

-increased levels of bilirubin(unconjugated)

22
Q

Normal process of death of RBCs

A
  1. heme converted to bilirubin in spleen and hepatocytes
  2. bilirubin processed by liver, becomes conjugated
  3. enters bile and excreted via feces
23
Q

Conjugated bilirubin excretion method

A

-water soluble and excreted via kidneys

24
Q

Pathogenesis of Hepatitis A

A
  • ingestion
  • replication in oropharynx/GI
  • transported to liver
  • shed in bile, transported to intestines
  • shed in feces
  • brief viremia
  • cellular immune response
25
Hepatitis Virus course
- ALT(alanine transaminase) highest 1 month after exposure - IgM antiHAV increases then decreases 1-5months - Total antiHAV log growth increase after 1month
26
Epidemiology of Hepatitis A
- close personal contact - contaminated food, water - blood exposure
27
Prevalence of antibodies for hepatitis A
- highest in N.A., Australia, Western Europe | - lowest everywhere else
28
Diagnosis of hepatitis A
-detection of HAV-IgM in serum
29
Diagnosis of past infection of hepatitis A
-detection of HAV-IgG in serum
30
HAV IgG/ HAV IgM interpretations
(+/+) - acute HAV infection (-/+) - acute HAV infection, but early phase (+/-) - no acute HAV infection, immunity (-/-) - no acute HAV infection, no immunity
31
Control of Hepatitis A
* infected people immune for life * - good hygiene, block transmission - passive or active immunization
32
Hepatitis A vaccinations
-present and 3 types