Learn About Hepatitis A

View Main Condition: Hepatitis

What is the definition of Hepatitis A?

Hepatitis A is inflammation (irritation and swelling) of the liver from the hepatitis A virus.

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What are the alternative names for Hepatitis A?

Viral hepatitis; Infectious hepatitis

What are the causes of Hepatitis A?

The hepatitis A virus is found mostly in the stool and blood of an infected person. The virus is present about 15 to 45 days before symptoms occur and during the first week of illness.

You can catch hepatitis A if:

  • You eat or drink food or water that has been contaminated by stools (feces) containing the hepatitis A virus. Unpeeled and uncooked fruits and vegetables, shellfish, ice, and water are common sources of the disease.
  • You come in contact with the stool or blood of a person who currently has the disease.
  • A person with hepatitis A passes the virus to an object or food due to poor hand-washing after using the toilet.
  • You take part in sexual practices that involve oral-anal contact.

Not everyone has symptoms with hepatitis A infection. Therefore, many more people are infected than are diagnosed or reported.

Risk factors include:

  • Overseas travel, especially to Asia, South or Central America, Africa and the Middle East
  • IV drug use
  • Living in a nursing home center
  • Working in a health care, food, or sewage industry
  • Eating raw shellfish such as oysters and clams

Other common hepatitis virus infections include hepatitis B and hepatitis C. Hepatitis A is the least serious and mildest of these diseases.

What are the symptoms of Hepatitis A?

Symptoms most often show up 2 to 6 weeks after being exposed to the hepatitis A virus. They are most often mild, but may last for up to several months, especially in adults.

Symptoms include:

  • Dark urine
  • Fatigue
  • Itching
  • Loss of appetite
  • Low-grade fever
  • Nausea and vomiting
  • Pale or clay-colored stools
  • Yellow skin (jaundice)
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What are the current treatments for Hepatitis A?

There is no specific treatment for hepatitis A.

  • You should rest and stay well hydrated when the symptoms are the worst.
  • People with acute hepatitis should avoid alcohol and drugs that are toxic to the liver, including acetaminophen (Tylenol) during the acute illness and for several months after recovery.
  • Fatty foods may cause vomiting and are best avoided during the acute phase of the illness.
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What is the outlook (prognosis) for Hepatitis A?

The virus does not remain in the body after the infection is gone.

Most people with hepatitis A recover within 3 months. Nearly all people get better within 6 months. There is no lasting damage once you've recovered. Also, you can't get the disease again. There is a low risk for death. The risk is higher among older adults and people with chronic liver disease.

What are the possible complications of Hepatitis A?

When should I contact a medical professional for Hepatitis A?

Contact your provider if you have symptoms of hepatitis.

How do I prevent Hepatitis A?

The following tips can help reduce your risk of spreading or catching the virus:

  • Always wash your hands well after using the restroom, and when you come in contact with an infected person's blood, stools, or other bodily fluid.
  • Avoid unclean food and water.

The virus may spread more rapidly through day care centers and other places where people are in close contact. Thorough hand washing before and after each diaper change, before serving food, and after using the toilet may help prevent such outbreaks.

Ask your provider about getting either immune globulin or the hepatitis A vaccine if you are exposed to the disease and have not had hepatitis A or the hepatitis A vaccine.

Common reasons for getting one or both of these treatments include:

  • You have hepatitis B or C or any form of chronic liver disease.
  • You live with someone who has hepatitis A.
  • You recently had sexual contact with someone who has hepatitis A.
  • You recently shared illegal drugs, either injected or noninjected, with someone who has hepatitis A.
  • You have had close personal contact over a period of time with someone who has hepatitis A.
  • You have eaten in a restaurant where food or food handlers were found to be infected or contaminated with hepatitis.
  • You are planning to travel to places where hepatitis A is common.

Vaccines that protect against hepatitis A infection are available. The vaccine begins to protect 4 weeks after you get the first dose. You will need to get a booster shot 6 to 12 months later for long-term protection.

Travelers should take the following steps to protect against getting the disease:

  • Avoid dairy products.
  • Avoid raw or undercooked meat and fish.
  • Beware of sliced fruit that may have been washed in unclean water. Travelers should peel all fresh fruits and vegetables themselves.
  • DO NOT buy food from street vendors.
  • Get vaccinated against hepatitis A (and possibly hepatitis B) if traveling to countries where outbreaks of the disease occur.
  • Use only carbonated bottled water for brushing teeth and drinking. (Remember that ice cubes can carry infection.)
  • If bottled water is not available, boiling water is the best way to get rid of hepatitis A. Bring the water to a full boil for at least 1 minute to make it safe to drink.
  • Heated food should be hot to the touch and eaten right away.
Digestive system
Hepatitis A
What are the latest Hepatitis A Clinical Trials?
A Randomized, Parallel Controlled Clinical Trial of the Safety and Immunogenicity of Hepatitis A (Live) Vaccine, Freeze-dried in Children Aged 18-24 Months Old

Summary: Subjects will be recruited and divided into 3 groups: Hepatitis A(Live)Vaccine,Freeze-dried produced by Changchun Institute of Biological Products Co., Ltd Hepatitis A(Live)Vaccine,Freeze-dried produced by Zhejiang Pukang Biotechnology Co., Ltd., and Hepatitis A(Live)Vaccine,Freeze-dried produced by Institute of Medical Biology, Chinese Academy of Medical Sciences. After immunization, the immunoge...

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Alcoholic Hepatitis Network Observational Study

Summary: The purpose of this research study is to create a clinical database and bio-repository. To do this, we will obtain blood, urine, saliva, and stool samples (e.g., biological samples) and personal health information from you to use in future research studies related to alcoholic hepatitis or other diseases. Part of your blood sample will be used to extract your DNA. DNA is the genetic material that ...

What are the Latest Advances for Hepatitis A?
AML-484 First Results of a Phase II Study (STIMULUS-AML1) Investigating Sabatolimab + Azacitidine + Venetoclax in Patients With Newly Diagnosed Acute Myeloid Leukemia (ND AML).
Acute Hepatitis A-Induced Autoimmune Hepatitis: A Case Report and Literature Review.
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The impact of rifaximin on inflammation and metabolism in alcoholic hepatitis: A randomized clinical trial.
Who are the sources who wrote this article ?

Published Date: February 06, 2022
Published By: Michael M. Phillips, MD, Emeritus Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

What are the references for this article ?

Freedman MS, Ault K, Bernstein H. Advisory Committee on Immunization Practices recommended immunization schedule for adults aged 19 years or older - United States, 2021. MMWR Morb Mortal Wkly Rep. 2021;70(6):193-196. PMID: 33571173. pubmed.ncbi.nlm.nih.gov/33571173/.

Pawlotsky J-M. Acute viral hepatitis. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 139.

Sjogren MH, Cheatham JG. Hepatitis A. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 11th ed. Philadelphia, PA: Elsevier; 2021:chap 78.

Wodi AP, Ault K, Hunter P, McNally V, Szilagyi PG, Bernstein H. Advisory Committee on Immunization Practices recommended immunization schedule for children and adolescents aged 18 years or younger - United States, 2021. MMWR Morb Mortal Wkly Rep. 2021;70(6):189-192. PMID: 33571172. pubmed.ncbi.nlm.nih.gov/33571172/.