Vaccination against hepatitis A has been very effective in preventing infection before exposure to the virus. Immunization of children between 2 and 18 years old consists of two to three doses of the vaccine. Adults need a booster dose six to 12 months after the initial dose of vaccine. Complete vaccination with all doses is believed to be effective for 15 to 20 years, so it's important to receive the whole vaccination series. The hepatitis A vaccine is not licensed for children younger than 2.
People who should be vaccinated include:
Immune globulin is primarily used to prevent the disease after exposure to the virus. The prophylactic value of IG is greatest when given early in the incubation period, and protection lasts only a few weeks. It can also used to protect travelers to areas with a high incidence of the disease, but the vaccination has largely replaced immune globulin for that use.
For hepatitis E infection, prevention is dependent upon a clean water supply and improved hygiene and sanitation practices in developing countries. Travelers to countries where hepatitis E is endemic should not assume protection against this virus even if they have been vaccinated against hepatitis A.
Frequent hand-washing with soap and water is key to preventing both types of infection, particularly after bowel movements and before food preparation. Avoiding tap water, food items washed in tap water, and raw, unpeeled fruits and vegetables when traveling is critical to preventing hepatitis A and E infections.
Last reviewed on 7/28/09
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