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Flashcards in hep A to G Deck (25):
1

hepatitis clinical presentation?

Ascites

caput medusae

icterus

palmar erythema

teleangiectasia

2

biochem results?

Causes of Elevated ALT (sGPT) or AST (sGOT) Values in Asymptomatic Patients*

3

hep and its causes?

A Autoimmune hepatitis
B Hepatitis (A)-B
C Hepatitis C-(G)
D Drugs or toxins
E Ethanol
F Fatty liver
G Growths (i.e., tumors)
H Hemodynamic disorder (congestive heart failure)
I Iron (hemochromatosis), copper (Wilson's disease) or alpha
1
-antitrypsin deficiency
M Muscle injury

4

acute vs chronic?

Acute (viral) hepatitis:
asymptomatic
mild icterus, elevated transaminases
severe, prolonged icterus
fulminant hepatitis with liver failure

Chronic (viral) hepatitis:
chronic persisting hepatitis
(virus detectable, few symptoms)
chronic active hepatitis
(continuous tissue destruction)
liver cirrhosis
primary liver cell carcinoma (hepatocellular)

5

hep clinical pic

A image thumb
6

hep A virus?

picornavirus, nonenveloped, ss (+) RNA (~10 kbases)
very stable: pH 3 or 60
oC for 10 h

frequently mild or anicteric, „yellow-flu / liver flu“
acute hepatitis, no persistence or chronic outcome
significantly more severe course in chronic hepatitis C

 

enteral (fecal/oral) transmission, „travel hepatitis“
transmission through contaminated water or raw foods, eg. Oysters (muckeaters...), and in hygienic facilities/ toilets
HAV epidemic in USA (Pittsburgh) from Chi-Chi® food products in the
‚Beaver Valley Mall‘: 490 cases, 3 deaths from liver failure (15.11.03)

(Dead)- vaccine with inactivated HAV (Havrix®: GlaxoSmithKline
Biologicals). The virus (strain HM175) is propagated in MRC-5 human
diploid (lung) cells which were taken from a male fetus aborted at 14 weeks
gestation.

Vaccination recommended for travellers in endemic areas,
and patients with chronic hepatitis B or C. 3 i.m. immunizations (0, 14 days,
6 months), children from 12 months of age.

for immediate / travel protection: passive immunization with
anti-HAV-positive immunoglobulins and/or a 2 step vaccination schedule (0,
4 to 6 months). Basic immunity conferred after the first vaccination

the best way to control hepatitis A infection in the hospital setting is good
hygienic practise  (re GI viral infections !!!)

7

hpe a diagnostic marker?

virus in stool, vriema, transaminase increase/icterus (3-9 months)

 

ttoal anti-HAV (3-12 months)

 

anti-HAV IgM (3-12 top at 6 months, low at 12 and 3 months.)

8

Hep E virus?

spherical, non-enveloped, single stranded RNA virus, approximately
32 to 34 nm in diameter.
HEV belongs to a genus of HEV-like viruses (genus Hepevirus).
?   preliminarily placed as 'calicivirus‚ (re GI virus infections)

transmission and clinical properties like HAV:
fecal / oral transmission
usually mild icterus, elevated transaminases
rarely: severe, prolonged icterus, high case fatality in pregnancy
the major etiological agent of enterically transmitted hepatitis 
worldwide: especially prevalent in South East Asia and Africa
In 2005 detected in Welsh patients and traced back to PORCINE
HEV.... (part of a Year 3 SSC with NPHS virology and Andrew Godkin)

9

hep b?

very small ds DNA virus: ca. 3.200 base pairs, Hepadna-Virus
infects only humans and chimpanzees
replication via RNA intermediates using a reverse transcriptase
Pararetrovirus

 

Enveloped ‚Dane particle‘, filamentous / oval  virus-like particles (VLP‘s),
‚Australia antigen

10

antigen markers for hep b?

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11

hep b markers through months?

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12

diff between acute and chronic hep b markers?

chronic = no anti-HBs

HBsAg is longer.

13

all the heps and their antigens?

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14

hep b flashcard?

Virus: Hepadna virus, no serotypes, ds circular  3200 bp DNA/RNA chimera

Reservoir tissue: human  liver cells

Incubation time: 45 – 180 days (~6 months)

Clinical picture: mostly assymptomatic, icterus: < 5 years: < 10%,  > 5
years: 30% - 50%, mortality during acute infection 0,5% - 1%, in
chronic infections < 5 years: 30 - 90%, > 5 years:   2 - 10%. 20%
leading to chronic hepatitis and  0.5% ending in hepatocellular
carcinoma.

Epidemiology: global

Mechanisms of cancerogenesis:  unclear (chronic inflammation?)

 

Lab diagnostics: serology, qual / quant PCR

Prevention: recombinant protein-vaccine: HBsAg from yeast HBvax
Pro®, Aventis Pasteur MSD, combined with inactivated

HAV: Twinrix®,

GlaxoSmithKline Biologicals; combined active-passive vaccination in
HBsAg-positive mothers with unknown status, vaccinations of all
newborns, vaccination of individuals in high risk groups(dialysis
patients, drug abusers)

Therapy: RT inhibitors, eg Lamivudine® (3TC - 2'deoxy, 3'thiacytidine); new
in 2006 entecavir, clevudine, telbivudine

15

hep D?

Coinfection of HBV with HDV
severe acute hepatitis
low  risik of chronic infection
Superinfection
invariably develops into chronic infection
high risik for severe chronic hepatitis
Hepatitis D
Hepatitis D is caused by the  Delta agent (Hepatitis D virus: HDV)
HDV is a defective circular small ss (-) RNA virus (1700 bases; viroid-like) and
can only be packaged in the presence of HBsAG in HBV infected cells
=> hepatitis D can only occur in association with HBV infection (satellite virus)
Discovered in 1977 by Dr. Mario Rizzetto and associates in Italy: in
patients affected by Hepatitis B. They observed a new antigen in
hepatitic liver cells different than surface, core and envelope systems that
they called "delta antigen".
(Gut 18:997-1003,1977)

16

hep b with HDV superinfection marker?

GOT

HBsAg

HDV RNA

total anit-HDV

no anti-HBs

IgM anti-HDV

17

hep c virus?

Family:       Flaviviridae
Genus:       Hepacivirus
Density: 1,03 - 1,2 g/cm3
Size: 50 - 60 nm
Genome:    (+) RNA, ~9,6 kb
Properties of the Hepatitis C virus (HCV)
EM morphology of HCV
Cell culture system: Wakita et al. 2005
Genotype 2a strain of HCV, JFH-1
Genotype 2a chimera, FL-J6/JFH
Genotype 1a (Hutchinson strain) H77S: Lemon et al.
In vitro system: Bartenschlager et al. 2003
G418-replicon by Bartenschlager and Rice-mostly
useful for drug screening

 

 

risk factors

 

1.iv

2unclear

3.sexual

18

hep  B risk factors?

1. sexual

2. oarenteral

3.perinatal

19

diagnostic markersof hep c infection?

HCV RNA

anti-HCV

GOT

20

hcv genotype?

I. Epidemiology
Confirm patient-to-patient transmission in outbreak investigations (eg
dentist North Wales 2006)
Types 1, 2, 3: global, prevalent in US and Europe
Type 4: Middle east and Africa
Type 5: South Africa
Type 6: Asia 

II. Prediction of clinical outcome
Subtype 1b infections  are more acute and tend to reinfect liver transplants
Type 2 infections are associated with type II cryoglobulinaemia

 

III. Genotype-specific treatment response

Type 4 good response
Type 2
Type 3
Type 1 (1b) no treatment response

21

hep c flah card?

Virus: Flavivirus (Genus hepacivirus), no serotypes, ss (+) lin RNA
Reservoir tissue: human liver cells, suspected dendritic cells
Incubation time: 2 - 26 weeks (~6 months), highly infectious
Clinical picture: mostly assymptomatic, rarely fulminant hepatitis (type
2a/ JFH strain), ~50% leading to chronic hepatitis and  up to 7% ending
in hepatocellular carcinoma.
Epidemiology: globally more significant than HIV or HepB
Mechanisms of cancerogenesis:
1. apoptosis inhibition (NS5a)
2. cell cycle effects G1> S (E2 (?), NS5: Rb binding proteins)
Lab diagnostics: serology, qual / quant PCR, genotyping
Prevention: no vaccine approved; peptide vaccine in phase 1 trials,
therapeutic vaccine under development (Biomerieux- MVA vaccine)
Therapy: pegylated interferon alpha combined with ribavirin / genotype
dependent response

22

hep f

Thus, there is no hepatitis F virus, but the position in the nomenclature
has been occupied for the time being .

23

hep g virus?

very similar to but distinct from Hepatitis C virus (Flaviviridae): 
ss (+) RNA, 10 kb
preliminarily placed into a group of new agents called GB viruses
(GB virus A, GB virus B and GB virus C)
not associated with any acute or chronic liver disease:
benign virus that is widely present throughout the world. 
Replicates best in lymphocytes/ not hepatocytes.
no association with poor outcomes of patients who are
infected with Hepatitis C / HIV and Hepatitis G at the same time.
Hep G may actually slow down HepC and HIV

transmitted following receipt of blood from HGV RNA-positive donor
moderate liver enzyme (ALT) elevations.


persistent infection (HGV RNA-positive) for as long as nine years.  

24

route of heps?

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