Dr Yeung Ho Hong 楊浩康 醫生 health-prevention-info

Hepatitis A Vaccine (甲型肝炎疫苗)

Dr Yeung Ho Hong ( 楊浩康 醫生 ) 2021-11-10

Hepatitis A Vaccine (甲型肝炎疫苗)


Hepatitis A is a liver disease caused by the hepatitis A virus. Hepatitis A virus is mainly transmitted through the fecal-oral route, that is, by contacting or eating objects, food or water contaminated by the patient's feces. Close contact or sexual contact with an infected person (not limited to anal or oral contact) may also be infected. Water sources contaminated with sewage or not processed thoroughly can also spread hepatitis A virus. The incubation period is usually 14-28 days. When a patient is infected with hepatitis A virus, common symptoms include fever, nausea, diarrhea, fatigue, abdominal discomfort, and jaundice. It often takes weeks to months for the hepatitis A patients to recover. Hepatitis A infection does not become chronic hepatitis, but there is a small chance that hepatitis A virus causes acute fulminant hepatitis which is with high mortality rate.

Hepatitis A vaccine can effectively prevent hepatitis A virus infection. hepatitis A vaccine requires 2 doses. The second dose can be given 6 to 18 months after the first dose. The hepatitis A vaccine is very safe. Common side effects included pain and redness at the injection site. A blood test can be done before having the hepatitis A vaccine. If the body already has hepatitis A antibodies, it means that the body is already immune to hepatitis A virus and therefore the person does not need to have hepatitis A vaccine.