What are the Hepatotropic viruses?
Infections are caused by five hepatotropic viruses: hepatitis A virus (HAV), hepatitis B virus (HBV), hepatitis C virus (HCV), hepatitis D virus (HDV) and hepatitis E virus (HEV). It is estimated that 1.5 million new cases of hepatitis A and 20 million new cases of hepatitis E occur every year.
What is pathophysiology of viral hepatitis?
Viruses enter the blood stream and spread to the liver. They infect the hepatocytes and multiply. They change the antigen structure on the virus site. The body begins to use self-mediated immune response attempting to damage the hepatocytes.
How viral hepatitis is transmitted?
How is it spread? Hepatitis A is spread when a person ingests fecal matter—even in microscopic amounts—from contact with objects, food, or drinks contaminated by feces or stool from an infected person.
How are the hepatitis viruses different?
A different virus is responsible for each type of virally transmitted hepatitis. Hepatitis A is always an acute, short-term disease, while hepatitis B, C, and D are most likely to become ongoing and chronic. Hepatitis E is usually acute but can be particularly dangerous in pregnant women.
Is hepatitis Ba DNA virus?
The hepatitis B virus (HBV) is a small DNA virus with unusual features similar to retroviruses. It is a prototype virus of the Hepadnaviridae family. Related viruses are found in woodchucks, ground squirrels, tree squirrels, Peking ducks, and herons.
What is the treatment for viral hepatitis?
Treatment of acute viral hepatitis involves resting, relieving symptoms, and maintaining an adequate intake of fluids. Treatment of chronic viral hepatitis involves medications to eradicate the virus and taking measures to prevent further liver damage.
What viral infections cause hepatitis?
In the United States, viral hepatitis is most commonly caused by hepatitis A virus (HAV), hepatitis B virus (HBV), and hepatitis C virus (HCV). These three viruses can all result in acute disease with symptoms of nausea, abdominal pain, fatigue, malaise, and jaundice.
Is hepatitis ba a virus?
Hepatitis B is a vaccine-preventable liver infection caused by the hepatitis B virus (HBV). Hepatitis B is spread when blood, semen, or other body fluids from a person infected with the virus enters the body of someone who is not infected.
Is Hepatitis A DNA or RNA virus?
Hepatitis A virus is an enteric picornavirus. Its genome is a single stranded RNA molecule of positive-strand polarity of 7478 bases.
What are the epidemiological determinants of hepatitis A?
7. Epidemiological determinants Agent factors a) AGENT: The causative agent, the hepatitis A virus, is an enterovirus of the Picornaviridae family. It multiplies only in hepatocytes. b) RESISTANCE: The virus is fairly resistant to heat and chemicals.
How is viral hepatitis resistant to heat and chemicals?
It multiplies only in hepatocytes. b) RESISTANCE: The virus is fairly resistant to heat and chemicals. -Withstands heating to 600 C for 1 hr. and is not affected by chlorine in doses usually employed for chlorination. -Formalin is stated to be an effective disinfectant.
Which is the main means of transmission of hepatitis?
Perinatal transmission is the main means of transmission in high prevalence populations.
How long does it take for hepatitis C to show up on Elisa?
Symptoms anti- HCV ALT Normal 0 1 2 3 4 5 6 1 2 3 4 Hepatitis C Virus Infection Typical Serologic Course Titre Months Years Time after Exposure 32. • HCV antibody – ELISA used to diagnose hepatitis C infection. Not useful in the acute phase as it takes at least 4 weeks after infection before antibody appears.
