![]() A second injection results in long-term protection. Protection begins approximately 2-4 weeks after the first injection. The hepatitis A vaccine is 94-100% effective in preventing the disease. Hepatitis A vaccination is the best way to prevent HAV infection. An infected person can transmit the hepatitis A virus to others up to 2 weeks before symptoms appear. Symptoms are usually mild and subside within 2 months, although symptoms can relapse for up to 6 months.
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