Hepatitis B, C, D, E Flashcards
Hepatitis B transmission
- blood borne
- sexually transmitted
- can live on environmental surfaces for up to 7 days
Which body fluids have high viral concentration
- blood
- serum
- wound exudates
Which body fluids have moderate viral concentrations
- semen
- vaginal fluid
- saliva
Which body fluids have low/not detectable
- urine
- feces
- sweat
- tears
- breast milk
Worldwide at-risk population for hepatitis B
- endemic countries such as asia, sub-saharan africa
- children of HBV-positive mothers
- travelers to endemic areas
- sexual contacts
US at-risk population for hepatitis B
- sexual contacts
- household contacts
- IV drug users
- health care workers
- people working with /receiving blood products or dialysis
- residents/staff of facilities for developmentally disabled persons
There is an increased prevalence of Hepatitis B in what populations
- HIV + persons
- IV drug users
- men having sex with men
- sexual/household contacts of HBsAg + persons
Who should get tested for hepatitis B
- anyone with acute presentation of liver disease
2. anyone in risk groups
acute hepatitis B infection: incubation
30-180 days, mean 60-90
HPI/ROS of acute hepatitis B infection
- General: fatigue, low-grade fever
- Skin: erythematous rash, urticaria
- HEENT: jaundice at day 10
- GI: nausea, bloated feeling
- MS: arthralgias
- VS: fever
- Skin: rash, jaundice
- HEENT: posterior cervical lymph nodes, icteric sclera
- GI: tender, palpable liver edge {70%}
Surface antigen and antibody for hepatitis B
Antigen- HBsAg
Antibody- anti-HBs
Core antigen and antibody for hepatitis B
Antigen- HBcAg
Antibody - anti-HBc
e=nucleocapsid protein {similar to C}
Antigen: HBeAg
Antibody: anti-HBe
Polymerase chain reaction test for viral load of hepatitis B
- DNA amplification technique able to detect as few as copies/mL
- very expensive
Indications of viral load test
- treatment decisions
- response to treatment
- chronic infection
- unusual presentation
Prevalence of chronic HBV
- two billion people have incidence of infection
- 800,000 - 1.4 million infected in US
- ninth leading cause of death worldwide
What percent of children and adults with chronic hepatitis B infections will develop cirrhosis or liver cancer
25% of childhood
15% of adults
Antigens and antibodies for chronic Hepatitis B infection
- HBsAg positive for > 6 months;
- total anti-HBc positive;
- HBeAg may have significance in long-term clinical course;
Hepatitis D infection always requires what other infection and why
HBV infection because it uses HBV protein shell;
** can occur acutely as a co-infection with HBV or as a superinfection after HBV
What is the most common blood-borne infection in the US
Hepatitis C
How is hepatitis C spread
parenteral route
What percent of patients with hepatitis C develop chronic liver disease
40-60%
Risk groups for hepatitis C
- current/former injection drug user
- pre 1987 clotting factor recipients
- pre-1992 transfusion/organ recipient
- dialysis patient
- person with known HCV exposure
- person with HIV/HBV
- children born to HCV + mother
- persons born between age of 1945-1965
Clinical course for hepatitis C
- incubates over 6-7 months
- 25% of people develop jaundice
- 1% mortality rate in acute infection
symptoms of hepatitis C
typically asymptomatic, indolent, prolonged course until advanced liver disease develops
Who should get tested for hepatitis C
- ever injected illegal drugs
- infected with HIV/HBV
- unexplained abnormal ALT/liver disease
- born to HCV + mother
- ever on hemodialysis
- needlestick
- sexual partner to HCV + person
- received clotting factors made before 1987 or blood/organs before 1992
- born between 1945-1965
Lab testing for hepatitis C
- screens for HCV antibodies
- detects antibodies 28-90 days after exposure
- does not distinguish acute from chronic
- misses approximately 10% of positives
- may see ALT fluctuate wildly and does not predict the extent of liver damage
- follow positive screening result with confirmatory testing
hepatitis C viral load
PCR: HCV RNA+ one to two weeks after infection
Indication: acute infection suspected
anti-HCV ambiguous or unconfirmed, infection suspected with normal LFTs
- repeat if negative with high suspicion of infection
- no sure correlation between high titer and disease severity
Genotyping testing for HCV
- informs treatment decisions
- type 1 HCV most common in US
- type 2 and 3 most likely to respond to treatment {24 weeks};
- type 1 more resistant to treatment {48 weeks}
Cofactors for hepatitis C disease severity
- alcohol
- age over 40 at time of infection
- HIV coinfection
- male
- other coinfection