How Do You Get Hepatitis A: Transmission and Prevention
Content last reviewed 2026-09-12 · Educational information — not medical advice
Quick answer
Hepatitis A spreads through the fecal-oral route — eating contaminated food or water, or close contact with an infected person. It's not spread through casual contact, coughing, or sex in the way other STIs are. Good hygiene and the hepatitis A vaccine are the main protections.
How is hepatitis A transmitted?
Hepatitis A spreads through the fecal-oral route: tiny amounts of stool from an infected person end up in food, water, or on surfaces, and then reach your mouth. This happens through contaminated food or water, poor hand hygiene after the bathroom, and close personal contact with someone infected. It's the reason outbreaks often trace back to restaurants or shared living situations. The virus is hardy and can survive on surfaces for weeks.
Can you get hepatitis A from food?
Yes — contaminated food and water are the classic routes. The virus can be present on produce grown or washed in contaminated water, in shellfish from polluted waters, and in food handled by an infected person who didn't wash their hands. The virus is hardy and can survive on surfaces, which is why hand hygiene is such a powerful prevention tool. Cooking food thoroughly and drinking safe water reduce the risk considerably.
Who is at risk for hepatitis A?
People at higher risk include travelers to countries with poor sanitation, household and sexual contacts of infected people, people experiencing homelessness, people who use drugs, men who have sex with men, and people with chronic liver disease (who face worse outcomes). Anyone can catch it, though — outbreaks happen in everyday settings. Vaccination is recommended for all children and for adults in these higher-risk groups.
How do you prevent hepatitis A?
The hepatitis A vaccine is the strongest protection and is recommended for all children and at-risk adults. Beyond that, wash hands thoroughly after the bathroom and before handling food, drink safe water, and avoid raw or undercooked shellfish in areas with sanitation concerns. If you've been exposed, a vaccine or immune globulin given within two weeks can help prevent infection. Good hygiene protects everyone around you.
How soon after exposure can a test detect it?
The IgM anti-HAV antibody becomes detectable about 2-4 weeks after exposure, around the time symptoms would appear. Testing before that window can return a false negative. If you were exposed recently, talk to a clinician about timing and whether post-exposure vaccination is appropriate. Knowing the window period helps you interpret results honestly instead of assuming a negative test means you're in the clear.
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Frequently asked questions
Can you get hepatitis A from kissing?
Kissing alone is very low risk. The virus spreads through the fecal-oral route, so close contact with poor hygiene is the bigger concern than kissing itself.
How long is hepatitis A contagious?
An infected person can shed the virus for about two weeks before symptoms appear and up to a week or two after jaundice develops, so hygiene matters throughout.