![]() After the virus enters the body, there is an incubation period lasting 2 to 7 weeks until illness begins. People usually get hepatitis A by having close contact with a person who is infected, from food or drinks prepared by someone who is infected, or by eating shellfish harvested from sewage-contaminated water. It enters the body through the mouth after someone handles something contaminated with HAV, or eats or drinks something contaminated with HAV. Hepatitis A virus is found in the stool (feces) of people with HAV infection. Hepatitis A is still common in Latin America, Africa, the Middle East, Asia, and eastern Europe. Still, there are cases of hepatitis A reported to the San Francisco Department of Public Health every year among San Francisco residents. In the USA, hepatitis A infections have declined by 90% since the hepatitis A vaccine first became available in 1995. Hepatitis A is a contagious liver infection caused by the hepatitis A virus (HAV). New Dosing of IM Immune Globulin for Hepatitis A Post Exposure Prophylaxis- Aug 2017.Forms for Specimen and Culture Submission.Non-Diagnostic General Health Assessments (NGHA).Check COVID-19 and Influenza Test Results Online.San Francisco Tuberculosis Prevention and Control Program (SFTBPCP) Supplemental Information.LTBI Risk Assessment Tools and Treatment Guidelines.Suspected/Confirmed Active TB Reporting.LTBI Referral (Specific to Civil Surgeons).Tuberculosis Information For Medical Providers.Yellow Fever Vaccine FAQ (Frequently Asked Questions).Emergency Mass Prophylaxis Clinic Planning.California Immunization Registry (CAIR).Programs for Asian and Pacific Islanders.Flu Vaccine Programs: Ordering Information for Health Care Providers.Infection Prevention and Control for Long-Term Care Facilities.Infection Prevention and Control for Health Care Settings.Disease Reporting: Additional Information for Medical Providers.What’s the difference: Hepatitis A vs hepatitis B.You can learn more about how we ensure our content is accurate and current by reading our editorial policy. We link primary sources - including studies, scientific references, and statistics - within each article and also list them in the resources section at the bottom of our articles. Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. In rare cases, severe hepatitis A can lead to liver failure, which may result in the need for a liver transplant. However, hepatitis A does not cause chronic liver damage in most people. Risk of liver damageĪccording to the CDC, 15–25% of people with chronic hepatitis B develop liver damage, liver failure, or liver cancer. People who have had hepatitis A do not have an increased risk of liver cancer. Hepatitis B can increase a person’s chances of developing liver cancer and is a leading cause of liver cancer. Once a person recovers, they cannot contract it again. Hepatitis A is an acute infection that lasts a few weeks to a few months. Learn more about the hepatitis B incubation period. People often do not know they have the infection. Hepatitis B can be a chronic condition that lasts for the rest of a person’s life. ![]() Learn more about hepatitis B and immunity. Reactivation can result from a sudden rise or reappearance of hepatitis B DNA in a person’s body. The hepatitis B virus, however, can reactivate and become chronic in people who have previously recovered from it. This is because people can develop antibodies to the hepatitis A virus. Once a person has had a hepatitis A infection and recovered, they cannot contract it again. For example, transmission can occur if people do not wash their hands after using the toilet and before preparing food. In the United States, hepatitis A often results from contact with food or feces containing the virus. Hepatitis A typically spreads through the fecal-oral route, such as when a person consumes food or water containing the virus or has sexual contact with someone who has the virus. Learn more about hepatitis B carriers and transmission. It can spread through sexual contact, sharing needles or other instruments that can puncture the skin, or other activities that spread saliva or other fluids between people. Hepatitis B spreads through contact with bodily fluids such as vaginal secretions, blood, semen, and saliva. Though hepatitis A and hepatitis B both affect the liver, they have several differences. ![]()
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