Hepatitis A spreads through contaminated food and water, or direct contact with someone who has it
You get hepatitis A by ingesting the virus, which lives in the stool of infected people. The most common route is eating food or drinking water contaminated by someone who didn't wash their hands after using the bathroom. You can also get it by touching your mouth after touching a contaminated surface, or through close contact with someone who is sick—though the virus itself doesn't spread through the air.
The virus enters through your digestive tract and infects your liver. Most people who get hepatitis A recover completely within a few weeks to a few months, and the infection does not become chronic. Once you've had it, you're immune for life.
Key Takeaways
- Hepatitis A spreads through contaminated food and water, most often when someone with the virus doesn't wash their hands after the bathroom.
- You can catch it by eating undercooked shellfish, unwashed produce, or food prepared by someone who is infected.
- Close living conditions, poor sanitation, and travel to areas with high rates of hepatitis A increase your risk.
- A vaccine exists and prevents hepatitis A in most people who receive it before exposure.
- Symptoms usually appear two to seven weeks after infection and include fatigue, nausea, abdominal pain, and jaundice.
Food and water as the main transmission route
Contaminated food is responsible for most hepatitis A cases in developed countries. The virus survives in the digestive system and is shed in stool for weeks, even after symptoms fade. If someone with hepatitis A prepares food without washing their hands thoroughly, the virus can contaminate anything they touch—salads, sandwiches, fruit, or ready-to-eat items.
Water contamination is a major source of hepatitis A in areas with poor sanitation. Drinking untreated water, ice made from contaminated water, or eating raw shellfish from contaminated waters can transmit the virus. Shellfish are particularly risky because they filter large volumes of water and can concentrate the virus.
Direct contact and household transmission
You can catch hepatitis A through close contact with someone who is infected, especially in households where hygiene is difficult to maintain. Sharing utensils, towels, or a bathroom with an infected person raises your risk. Changing diapers or caring for young children with hepatitis A without careful handwashing is a common way caregivers become infected.
The virus can survive on surfaces for hours or days, depending on temperature and humidity. Touching a contaminated doorknob, light switch, or countertop and then touching your face or eating without washing your hands can transmit the infection. This is why outbreaks sometimes occur in childcare settings or schools.
Who is at higher risk
People who travel to countries with high rates of hepatitis A face increased risk, particularly in Central America, South America, Africa, and parts of Asia. Travelers who eat street food, drink tap water, or stay in areas with poor sanitation are most vulnerable. Even brief visits to endemic areas can result in infection.
Men who have sex with men have historically experienced higher rates of hepatitis A, though vaccination has reduced this. People with chronic liver disease, including hepatitis B or C, face more severe illness if they contract hepatitis A. People who use injection drugs and share equipment also have elevated risk due to poor hygiene conditions and close living situations.
Household members and close contacts of someone with hepatitis A are at direct risk. Childcare workers and healthcare workers who handle patients without strict infection control also face occupational exposure.
Symptoms and when they appear
Hepatitis A symptoms usually appear two to seven weeks after infection, though the range can extend to 15 weeks. Early symptoms resemble the flu: fatigue, fever, abdominal pain, nausea, and loss of appetite. Some people have diarrhea or constipation.
As the infection progresses, jaundice often develops—yellowing of the skin and eyes, dark urine, and pale stools. Joint pain and itching can occur. Symptoms typically last several weeks, and some people remain ill for months. Older adults and people with underlying liver disease tend to have more severe and prolonged illness.
Children under six often have no symptoms at all, or very mild ones, even though they can still transmit the virus to others. This makes them a common source of household outbreaks.
Prevention through vaccination and hygiene
A hepatitis A vaccine is the most effective way to prevent infection. It's given as two doses, six to twelve months apart, and provides protection in more than 95 percent of vaccinated people. The vaccine is recommended for all children starting at age one, and for adults who travel to endemic areas, have chronic liver disease, or have other risk factors.
If you're exposed to hepatitis A and haven't been vaccinated, post-exposure vaccination within two weeks of exposure may prevent illness. Immune globulin (a blood product containing antibodies) can also be given after exposure, though it's less commonly used now that vaccine is widely available.
Handwashing is the most important hygiene measure. Wash your hands with soap and warm water after using the bathroom, before eating, and after caring for someone who is sick. Alcohol-based hand sanitizers are less effective against hepatitis A than soap and water. Cook food to safe temperatures, wash produce thoroughly, and avoid drinking untreated water when traveling.
What to do if you think you have been exposed
If you've had close contact with someone who has hepatitis A and you're not vaccinated, contact your doctor or local health department within two weeks. They can determine whether post-exposure vaccination or immune globulin is appropriate based on your age, health status, and the timing of exposure.
If you develop symptoms—fatigue, abdominal pain, nausea, or jaundice—see a doctor for testing. A blood test can confirm hepatitis A. There's no specific treatment; care focuses on rest, fluids, and managing symptoms while your immune system clears the virus. Most people recover without complications, but severe cases may require hospitalization.
If you're diagnosed with hepatitis A, inform your close contacts and your workplace or school. Avoid preparing food for others, and practice strict handwashing to reduce transmission risk.
Frequently Asked Questions
Can you get hepatitis A more than once?
No. Once you've had hepatitis A, your immune system produces antibodies that protect you for life. You cannot be reinfected with the same virus.
Is hepatitis A the same as hepatitis B or C?
No. Hepatitis A is spread through food and water and does not become chronic. Hepatitis B and C spread through blood and body fluids and can cause long-term liver damage. They are different viruses requiring different prevention and treatment.
How long can someone with hepatitis A spread the virus?
People shed the virus in their stool for about two weeks before symptoms appear and for one to two weeks after. Children may shed it longer. Even without symptoms, infected people can transmit the virus.
What should I do if I'm traveling to a country with high hepatitis A rates?
Get vaccinated at least two weeks before travel if possible. Drink bottled or boiled water, avoid ice, eat cooked foods, and wash your hands frequently. Avoid raw or undercooked shellfish and unwashed produce.
Can hepatitis A cause permanent liver damage?
Hepatitis A does not cause chronic infection or permanent scarring. Your liver recovers completely after the acute illness passes. However, people with existing liver disease may experience more severe complications.