Hepatitis A

Hepatitis A

What is hepatitis?

The liver is one of the organs that helps with digestion, but is not part of the digestive tract. It is the largest organ in the body and carries out many important functions, such as making bile, changing food into energy, and cleaning alcohol and poisons from the blood.

Hepatitis is inflammation of the liver that sometimes causes permanent damage. It is caused by viruses, bacteria, certain medications, or alcohol. It may also be caused by certain diseases, such as autoimmune diseases, metabolic diseases, and congenital (present at birth) abnormalities, such as biliary atresia and Wilson's disease. Generally, symptoms of hepatitis include fever, jaundice  (yellowing of the skin and eyes), and an enlarged liver. There are several types of hepatitis.

Illustration of the  anatomy of the biliary system
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What is hepatitis A?

Hepatitis A is a highly contagious and sometimes serious liver disease caused by the hepatitis A virus. Once called infectious hepatitis, today it is more commonly known as hepatitis A.

Hepatitis A does not result in chronic infection, but complete recovery from hepatitis A can be slow. In adult patients with hepatitis A, the illness may last for at least one month, with recovery taking up to six months. Hepatitis A rates in the United States have declined by 92 percent since the vaccine (hepatitis A) first became available in 1995.

Prevention protocols when traveling

Avoid untreated tap water in drinks or ice cubes.

Drink and brush your teeth using only bottled or boiled water.

Do not eat unpeeled fruits, salads, uncooked vegetables, or raw shellfish (for example, clams, oysters, and mussels).

Do not eat food or drink beverages (except commercially bottled beverages) bought from street vendors.

Hepatitis A may also be avoided through vaccination with immune globulin (IG) or hepatitis A vaccine.

IG contains antibodies (or protective proteins) to the hepatitis A virus. IG is relatively inexpensive and provides short-term protection against hepatitis A disease (generally three to five months).

Hepatitis A vaccine helps provide longer-term protection against hepatitis A. One study demonstrated resistance for at least four years.

What are the symptoms of hepatitis A?

The following are the most common symptoms of hepatitis A. However, each individual may experience symptoms differently. Symptoms of hepatitis A often resemble flu-like symptoms. Symptoms may include:

In some adults and in most children, especially those younger than 6 years of age, there are often no symptoms. The symptoms of hepatitis A may resemble other medical conditions or problems. Always consult your doctor for a diagnosis.

What causes hepatitis A?

This type of hepatitis is usually spread by fecal-oral contact or fecal-infected food and water, and may also be spread by blood-borne infection (which is rare). The following is a list of modes of transmission for hepatitis A:

Generally, casual contact in school or the workplace does not cause spread of the virus.

What are the risk factors for hepatitis A?

Children, teens, and adults who may be at high risk of hepatitis A include the following:

Hepatitis A is sometimes called a traveler's disease because it is the most frequently occurring, vaccine-preventable infection in travelers. However, it is possible to become infected with hepatitis A virus without ever leaving the United States. Some cases reported in the United States have occurred in people with no identifiable risk factors.

Prevention of hepatitis A

In addition to avoiding risky behaviors, there are two methods for prevention of hepatitis A:

The Centers for Disease Control and Prevention recommend the hepatitis A vaccine for the following groups who are at risk for the infection, as well as for anyone who wants to have the vaccine:

How is hepatitis A diagnosed?

In addition to a complete medical history and physical examination, a blood test called IgM anti-HAV is needed to diagnose hepatitis A. This test looks specifically for the presence of antibodies against the hepatitis A virus in the blood.

Treatment for hepatitis A

Specific treatment for hepatitis A will be determined by your doctor based on:

Most people recover from hepatitis A infection without medical intervention; however, bed rest and some medications may be suggested.

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