Hepatitis B - Fact Sheet for Parents

Diseases and the Vaccines that Prevent Them

Español: Hepatitis B

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What is hepatitis B?

Hepatitis B is a serious liver disease caused by the hepatitis B virus. Hepatitis B infection can be an acute (short-term) illness that can last up to 6 months. Or it can be a chronic (lifelong) illness that can cause liver damage, liver cancer, and death.

What are the symptoms of hepatitis B?

Children under 5 years old usually have no symptoms.

In about 7 out of 10 older children and adults, short-term hepatitis B causes the following:

• Loss of appetite (not wanting to eat)
• Fever
• Tiredness
• Pain in muscles, joints, and stomach
• Nausea, diarrhea, and vomiting
• Dark urine
• Yellow skin and eyes

Symptoms of short-term illness usually appear 3 or 4 months after infection.

How serious is hepatitis B?

Hepatitis B can be very serious. Most people with short-term hepatitis B feel sick for a few weeks to a several months. Some people get over the illness. For other people, the virus stays in their body for a life time.

People with lifelong hepatitis B usually don’t have symptoms, but the virus causes liver damage over time. For these people, there is no cure for the disease.

Each year, 3,000 to 5,000 people in the U.S. die from liver damage or liver cancer caused by hepatitis B.

How does hepatitis B spread?

Hepatitis B spreads through blood or other body fluids, like saliva or sores (which may contain small amounts of blood), of an infected person. People can spread the virus even when they have no symptoms.

Babies and children can get hepatitis B in the following ways:

• At birth from their infected mother.
• From bites from an infected person.
• By touching cuts or sores of an infected person.
• Through sharing toothbrushes or other personal items used by an infected person.
• From food that was chewed (for a baby) by an infected person.
• From ear piercing needles that were not cleaned well.

The virus can live on objects for up to 7 days. Even if you don’t see any blood or saliva, there could be virus on an object.

What is the hepatitis B vaccine?

The hepatitis B vaccine protects against getting hepatitis B. It is a copy of only one small part of the virus. The hepatitis B vaccine protects children by preparing their bodies to fight the virus.

Almost all children (98 children out of 100) who get three doses of the vaccine will be protected from hepatitis B.

When should my child get the hepatitis B vaccine?

Children need three doses of the hepatitis B vaccine at the following ages for best protection:

• The first dose at birth (within 12 hours if the mother has hepatitis B infection);
• A second dose at 1 through 4 months; and
• A third dose at 6 through 18 months of age.

Older children who did not get the vaccine as a baby should get it as soon as possible.

Why should my child get the hepatitis B vaccine?

Getting your child the hepatitis B vaccine protects him against serious disease.

Of the more than 1 million people in the United States living with life-long hepatitis B, most got the virus as a child. When infants and young children are infected with hepatitis B, they have a 90% chance of developing a life-long, chronic infection. One out of 4 of these children will have serious liver disease as an adult, including cancer.

Children and adults with life-long hepatitis B can pass on the virus to other people.

If my child does not get the hepatitis B vaccine, will he get the disease?

Children who do not get the vaccine for hepatitis B are at risk for infection. More than 1 million people in the U.S. have life-long hepatitis B. Most don’t know it.

Is the hepatitis B vaccine safe?

The hepatitis B vaccine is very safe, and it is effective at preventing hepatitis B. Vaccines, like any medicine, can have side effects. But no serious side effects have been reported for the hepatitis B vaccine.

Most people who get the hepatitis B vaccine will have no side effects at all. Those that do occur are very mild, such as a low fever (less than 101 degrees) or a sore arm from the shot.

Where can I learn more about the hepatitis B vaccine?

To learn more about the hepatitis B vaccine or other vaccines, talk to your child’s doctor.

Call 800-CDC-INFO (800-232-4636) or go to the CDC Vaccines web site and check out the following resources:

• Parent’s Guide to Childhood Immunization
• Common Questions Parents Ask about Infant Immunizations
• Vaccines website for parents