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Vaccines for Hepatitis A & B

By Brenda Conaway
WebMD Feature
Reviewed by Louise Chang, MD

You may have a family member who has viral hepatitis. Or perhaps you recently saw a news brief about a celebrity who contracted hepatitis A or B. Whatever the reason, you want information about a viral illness that you may not have thought much about. What is viral hepatitis? Are you at risk for it? Do you need viral hepatitis vaccines?

Hepatitis A and B: Diseases of the Liver

Hepatitis is an inflammation of the liver, most often caused by a viral infection. There are three common types of hepatitis caused by viruses: hepatitis A, hepatitis B, and hepatitis C. Vaccines have been developed that protect people from contracting hepatitis A and B. There is no vaccine for hepatitis C.

Hepatitis A and hepatitis B can be spread from person to person, although in different ways. They have similar symptoms, which include abdominal pain, fever, fatigue, joint pain, and jaundice (yellowing of the skin and whites of the eyes).  

Over the last 20 years, there has been a 90% decrease in cases of hepatitis A and an 80% decrease in hepatitis B cases in the U.S. Health experts believe that immunization efforts have led to this drop in rates of infection.

How Hepatitis Is Spread

Hepatitis A: About 20,000 people in the U.S. contract hepatitis A each year. The hepatitis A virus is found in the stool of the infected person. It is spread through contaminated food or water or by certain types of sexual contact.  

Children who get hepatitis A often don't have symptoms, so they can have the virus and not know it. However, they can still spread it easily. Fortunately, children are now routinely vaccinated against hepatitis A.   

Most people who get hepatitis A recover completely within two weeks to six months and don't have any liver damage. In rare cases, hepatitis A can cause liver failure and even death in older adults or people with underlying liver disease.

Hepatitis B: Every year, about 40,000 people in the U.S. become infected with hepatitis B. Acute hepatitis lasts from a few weeks to several months. Many infected people are able to clear the virus and remain virus-free after the acute stage. However, for others, the virus remains in the body, and they develop chronic hepatitis B infection, which is a serious, lifelong condition. About 1.2 million people in the U.S. have chronic hepatitis B. Of these, 15% to 25% will develop more serious health problems, such as liver damage, cirrhosis, liver failure, and liver cancer, and some people die as a result of hepatitis B-related disease.

Hepatitis B can be spread from one person to another from the blood, semen, or other body fluids of an infected person. In the U.S., sexual contact is the most common way that hepatitis B is spread. It can also be spread by sharing needles or other equipment used to inject drugs. In addition, a mother can pass hepatitis B to her baby during birth.  

Hepatitis B cannot be spread by contaminated water, food, cooking, or eating utensils, or by breastfeeding, coughing, sneezing, or close contact such as kissing and hugging.

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