It lasts from 3 to 6 weeks, but can persist up to 6 months. Most patients recover with no serious long term health problems. Symptoms are more severe in adults than in children who often have no symptoms. HAV is spread when infected human feces is ingested by mouth. For people already exposed to the virus, immune globulin can reduce the risk of infection if given within 14 days of exposure.
Most adults fight off infection and have no long-term health problems.
HBV is spread through contact with infected body fluids or blood. The vaccine is recommended as part of the routine schedule of childhood immunizations. Many states require this vaccination for entry to elementary school Because the vaccine was not routinely given to infants until 1991, children born before then may not be protected. Immunization experts recommend vaccination of all children up to age 18 to fill this gap. The government's Vaccine for Children program will pay for immunizations for eligible up to 18 years old.