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Hepatitis A is a contagious liver infection caused by the hepatitis A virus (HAV), usually appearing in the form of acute hepatitis.
You're most likely to get hepatitis A from food or water contaminated with the virus.
In particular, although the infection is common in underdeveloped countries with poor hygiene conditions, the infection rate has recently been on the rise even among people in their 20s and 30s who grew up in good hygienic conditions.
HAV is usually transmitted through direct contact with an infectious person, and in some cases, can be transmitted to a fetus from an infected mother, or can be caused by the blood transfusion or can be parenterally infected among gays.
The hepatitis A virus is transmitted primarily by the oral route; that is when an uninfected person ingests food or water that has been contaminated with the faeces of an infected person, and a group outbreak is usually associated with sewage-contaminated or inadequately treated water.
Hepatitis A can be suspected through characteristic clinical patterns in which jaundice occurs within a week after the general symptoms, and can be confirmed through hepatitis A antibody test.
Infection of Hepatitis A can be prevented by vaccines.
Nearly 95% of people develop protective levels of antibodies to the virus by injecting an additional vaccine in 6-12 months or 6-18 months after the first vaccination depending on the type of vaccines.
This works not only for children over the age of two, but also for adults who have not yet been exposed to the virus.
The side effects of the vaccination locally occur in the form of fever or headache and the red reaction around the injected area.