Hepatitis A is a serious liver infection caused by the hepatitis A virus (HAV). HAV is found in the stool of an infected person.
Everyone is susceptible to HAV, the virus that causes a hepatitis A infection, unless they have had the illness in the past or have been vaccinated against it. Some people are especially susceptible, including those who:
HAV is usually spread by close personal contact with a person who is infected with HAV and/or by eating food or drinking water containing HAV. A person who has the infection can easily pass the disease to others in the same household.
Hepatitis A can cause a wide variety of symptoms ranging from fever, fatigue, and nausea and vomiting to more serious problems, such as yellowing of the eyes or skin (jaundice), severe stomach pains, and diarrhea that may require hospital admission. Some people get a HAV infection and have no symptoms of the disease.
If symptoms occur, they will begin anywhere from 2 to 6 weeks after exposure, commonly around 28 days (4 weeks) later. Symptoms usually develop over a period of several days.
A person can transmit the virus to others up to 2 weeks before symptoms appear and for about 1 week after the onset of jaundice.
Yes, prior infection with HAV makes a person immune to later infection.
In rare instances, a HAV infection can result in liver failure and death.
No specific treatment exists for HAV. Your body will clear HAV on its own. HAV treatment is supportive and mainly focuses on coping with your signs and symptoms.
There are safe and effective vaccines against HAV. One type is given as 2 shots, 6 months apart. The vaccine also comes in a combination form, containing both hepatitis A and B vaccine, that can be given to persons 18 years of age and older. This vaccine is given as 3 shots, over a period of 6 months.
Yes, the hepatitis A vaccines are highly effective in preventing HAV infection. Protection begins approximately 2 to 4 weeks after the first injection. The second dose results in long-term protection.
The best way to avoid infection with HAV is by vaccination with the Hepatitis A vaccine.
Hepatitis A vaccine can be used to prevent infection, preferably within 2 weeks of last exposure to the HAV, in those 1-40 years old. Due to the risk of severe infection, those less than 1 year or over 40 years of age are preferably protected from a known exposure through an injection of Immune globulin (IG), but vaccine can also be used if IG is not available. If IG is used, protection is immediate but lasts only
about 3 months, so vaccination is often given along with IG.
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