Hepatitis A

It is the most common type of viral hepatitis,caused by the picornavirus of enterovirus group.The hepatities A virus  is very infectious and spreads mainly by  the faecal-oral route,through ingestion of contaminated food or water.Overcrowding and poor sanitation helps in spreading the disease. After infection,the viruses replicate in the liver,excreted in the bile and then in the faces of the infected patient for about 2 weeks before the onset of clinical illness and upto 7 days after.There is no carrier state of hepatities A virus.The incubation period is about 30 days.It is also called infectious,or epidemic or short-incubation hepatitis