Hepatitis A Questions and Answers for the Public
Index of Questions
- How is hepatitis A spread?
- Who is at risk for hepatitis A?
- What should I do if I think I have been exposed to hepatitis A virus?
- Can I prevent infection after an exposure to the hepatitis A virus?
- If I have had hepatitis A in the past, can I get it again?
- How long does hepatitis A virus survive outside the body?
- How can I protect myself against hepatitis A?
- Who should get vaccinated against hepatitis A?
- How is the hepatitis A vaccine given?
- Is the hepatitis A vaccine effective?
- Is the hepatitis A vaccine safe?
- Who should not receive the hepatitis A vaccine?
- What is immune globulin?
- Will the hepatitis A vaccine protect me from other forms of hepatitis?
- Can hepatitis A vaccine be given to people with compromised immune systems, such as hemodialysis patients or people with HIV/AIDS?
- Is it harmful to have an extra dose of hepatitis A vaccine or to repeat the entire hepatitis A vaccine series?
- What should be done if the last dose of hepatitis A vaccine is delayed?
- Where can I get the hepatitis A vaccine?
What is hepatitis?
Hepatitis means inflammation of the liver. When the liver is inflamed or damaged, its function can be affected. Heavy alcohol use, toxins, some medications, and certain medical conditions can cause hepatitis, but it is often caused by a virus. In the United States, the most common hepatitis viruses are hepatitis A virus, hepatitis B virus, and hepatitis C virus.
What is the difference between hepatitis A, hepatitis B, and hepatitis C?
Hepatitis A, hepatitis B, and hepatitis C are liver infections caused by three different viruses. Although each can cause similar symptoms, they are spread in different ways and can affect the liver differently. Hepatitis A is usually a short-term infection and does not become chronic. Hepatitis B and hepatitis C can also begin as short-term, acute infections, but in some people, the virus remains in the body, resulting in chronic disease and long-term liver problems. There are vaccines to prevent hepatitis A and hepatitis B; however, there is no vaccine for hepatitis C.
The page “What is hepatitis?” more information about the differences between hepatitis A, hepatitis B, and hepatitis C.
What is hepatitis A?
Hepatitis A is a highly contagious, short-term liver infection caused by the hepatitis A virus.
How serious is hepatitis A?
People who get hepatitis A may feel sick for a few weeks to several months but usually recover completely and do not have lasting liver damage. In rare cases, hepatitis A can cause liver failure and even death; this is more common in older people and in people with other serious health issues, such as chronic liver disease.
How common is hepatitis A in the United States?
In 2018, there were an estimated 24,900 hepatitis A cases were reported in the United States. Because some people don’t ever get diagnosed, the actual number of cases reported in that year is probably closer to 24,900. Since 2016, person-to-person outbreaks of hepatitis A have been occurring across the United States mainly among people who use injection drugs or are experiencing homelessness, resulting in more than 32,000 cases.
Are cases of hepatitis A increasing in the United States?
Since the hepatitis A vaccine was first recommended in 1996, cases of hepatitis A in the United States declined dramatically. Unfortunately, in recent years the number of people infected has been increasing because there have been multiple outbreaks of hepatitis A in the United States resulting from person-to-person contact, especially among people who use drugs, people experiencing homelessness, and men who have sex with men.
Transmission / Exposure
How is hepatitis A spread?
The hepatitis A virus is found in the stool and blood of people who are infected. The hepatitis A virus is spread when someone ingests the virus (even in amounts too small to see) through:
Hepatitis A can be spread from close, personal contact with an infected person, such as through certain types of sexual contact (like oral-anal sex), caring for someone who is ill, or using drugs with others. Hepatitis A is very contagious, and people can even spread the virus before they feel sick.
►Eating contaminated food or drink
Contamination of food with the hepatitis A virus can happen at any point: growing, harvesting, processing, handling, and even after cooking. Contamination of food and water happens more often in countries where hepatitis A is common. Although uncommon, foodborne outbreaks have occurred in the United States from people eating contaminated fresh and frozen imported food products.
Who is at risk for hepatitis A?
Although anyone can get hepatitis A, in the United States, certain groups of people are at higher risk for getting infected and for having severe disease if they do get hepatitis A.
People at increased risk for hepatitis A
- International travelers
- Men who have sex with men
- People who use or inject drugs (all those who use illegal drugs)
- People with occupational risk for exposure
- People who anticipate close personal contact with an international adoptee
- People experiencing homelessness
People at increased risk for severe disease from hepatitis A infection
- People with chronic liver disease, including hepatitis B and hepatitis C
- People with HIV
What should I do if I think I have been exposed to hepatitis A virus?
If you think you have been exposed to the hepatitis A virus, call your health professional or your local or state health department as soon as possible, ideally within 2 weeks. A health professional can decide next steps based on your age and overall health.
Can I prevent infection after an exposure to the hepatitis A virus?
A single shot of the hepatitis A vaccine can help prevent hepatitis A if given within 2 weeks of exposure. Depending upon your age and health, your doctor may recommend immune globulin in addition to the hepatitis A vaccine.
If I have had hepatitis A in the past, can I get it again?
No. Once you recover from hepatitis A, you develop antibodies, protecting you for life.
How long does hepatitis A virus survive outside the body?
The hepatitis A virus can survive outside the body for months. Heating food and liquids to temperatures of 185°F (85°C) for at least 1 minute can kill the virus. Exposure to freezing temperatures does not kill the virus.
What are the symptoms of hepatitis A?
Not everyone with hepatitis A has symptoms. Adults are more likely to have symptoms than children. If symptoms develop, they usually appear 2 to 7 weeks after infection. Symptoms usually last less than 2 months, although some people can be ill for as long as 6 months.
If symptoms develop, they can include:
- Yellow skin or eyes
- Not wanting to eat
- Upset stomach
- Throwing up
- Stomach pain
- Dark urine or light- colored stools
- Joint pain
- Feeling tired
Can a person spread hepatitis A virus without having symptoms?
Yes. Many people, especially children, have no symptoms but can still spread the infection. In addition, a person can transmit the hepatitis A virus to others up to 2 weeks before symptoms appear.
Diagnosis / Treatment
How is hepatitis A diagnosed?
A doctor can determine if you have hepatitis A by discussing your symptoms and ordering a blood test that can tell whether you have been recently infected with the virus that causes hepatitis A.
How is hepatitis A treated?
To treat the symptoms of hepatitis A, doctors usually recommend rest, adequate nutrition, and fluids. Some people with severe symptoms will need medical care in a hospital.
Prevention / Vaccination
How can I protect myself against hepatitis A?
The best way to prevent hepatitis A is through vaccination with the hepatitis A vaccine. To get the full benefit of the hepatitis A vaccine, more than one shot is needed. The number and timing of these shots depends on the type of vaccine you are given. Practicing good hand hygiene — including thoroughly washing hands after using the bathroom, changing diapers, and before preparing or eating food — plays an important role in preventing the spread of hepatitis A.
Who should get vaccinated against hepatitis A?
The following people should be vaccinated against hepatitis A:
- All children aged 12–23 months
- All children and adolescents 2–18 years of age who have not previously received hepatitis A vaccine (known as “catch up” vaccination)
Other people recommended for vaccination
- Pregnant women at risk for hepatitis A or risk for severe outcome from hepatitis A infection
- Any person who requests vaccination
How is the hepatitis A vaccine given?
There are two types of hepatitis A vaccine. The first type, the single-dose hepatitis A vaccine, is given as two shots, 6 months apart, and both shots are needed for long-term protection against hepatitis A. The other type is a combination vaccine that protects people against both hepatitis A and hepatitis B. The combination vaccine can be given to anyone 18 years of age and older and is given as three shots over 6 months. All three shots are needed for long-term protection for both hepatitis A and hepatitis B.
Is the hepatitis A vaccine effective?
Yes, both types of hepatitis A vaccine are highly effective in preventing hepatitis A virus infection. Receiving the entire vaccine series (all of the required shots) results in long-term protection.
Is the hepatitis A vaccine safe?
Yes, the hepatitis A vaccine is safe. No serious side effects have been reported from the hepatitis A vaccine. Soreness at the injection site is the most common side effect reported. As with any medicine, there is always a small risk that a serious problem could occur after someone gets the vaccine. However, the potential risks of hepatitis A are much greater than the potential risks associated with the hepatitis A vaccine. Millions of doses of hepatitis A vaccine have been given in the United States and worldwide since the first hepatitis A vaccine was licensed in 1995.
Who should not receive the hepatitis A vaccine?
People who have ever had a life-threatening allergic reaction to the hepatitis A vaccine or who are known to be allergic to any part of the hepatitis A vaccine should not receive the vaccine. Tell your doctor if you have any severe allergies. Also, the vaccine is not licensed for use in infants under age 1 year.
What is immune globulin?
Immune globulin is a substance made from human blood plasma that contains antibodies, which are the body’s natural defense against infection. Injections of immune globulin may be given under certain circumstances, like when someone is too young to get vaccinated or can’t get vaccinated because of a previous, life-threatening reaction to the hepatitis A vaccine or vaccine component. Unlike the hepatitis A vaccine, immune globulin does not provide long-term protection against infection.
Will the hepatitis A vaccine protect me from other forms of hepatitis?
No. The hepatitis A vaccine only protects against hepatitis A. There is a separate vaccine available for hepatitis B. There is also a combination hepatitis A and hepatitis B vaccine that offers protection for both viruses. There is no vaccine for hepatitis C at this time.
Can hepatitis A vaccine be given to people with compromised immune systems, such as hemodialysis patients or people with HIV/AIDS?
Yes. The hepatitis A vaccine can be given to people with compromised immune systems.
Is it harmful to have an extra dose of hepatitis A vaccine or to repeat the entire hepatitis A vaccine series?
No, getting extra doses of hepatitis A vaccine is not harmful.
What should be done if the last dose of hepatitis A vaccine is delayed?
If the second dose has been delayed (more than 6 months since the first dose was given), it should be given as soon as possible. The first dose does not need to be given again.
Where can I get the hepatitis A vaccine?
Speak with your health-care provider or call your local public health department, where free or low-cost vaccines for adults may be offered. For children, check the Vaccines for Children Program.
Hepatitis A Vaccine and International Travel
Who should get the hepatitis A vaccine before traveling internationally?
All unvaccinated people, along with those who have never had hepatitis A, should be vaccinated before traveling to countries where hepatitis A is common. Travelers to urban areas, resorts, and luxury hotels in countries where hepatitis A is common are still at risk. International travelers have been infected, even though they regularly washed their hands and were careful about what they drank and ate. Those who are too young or can’t get vaccinated because of a previous, life-threatening reaction to the hepatitis A vaccine or vaccine component should receive immune globulin. Travelers to other countries where hepatitis A does not commonly occur are not recommended to receive hepatitis A vaccine before travel.
How soon before travel should I get the hepatitis A vaccine?
You should get the first dose of hepatitis A vaccine as soon as you plan international travel to a country where hepatitis A is common. The vaccine will provide some protection even if you get vaccinated closer to departure. For older adults (age >40 years), people who are immunocompromised, and people with chronic liver disease or other chronic medical conditions the health-care provider may consider, based on several factors, giving an injection of immune globulin at the same time in different limbs.
What should I do if I am traveling internationally but cannot receive hepatitis A vaccine?
People who are allergic to a vaccine component or are younger than 6 months should receive a single dose of immune globulin before traveling to a country where hepatitis A is common. Immune globulin provides effective protection against hepatitis A virus infection for up to 2 months, depending on the dosage given. If you are staying longer than 2 months, you can get another dose of immune globulin during your visit for continued protection against hepatitis A.