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Delta agent (Hepatitis D)

Contents of this page:

Illustrations

Hepatitis B virus
Hepatitis B virus

Alternative Names    Return to top

Hepatitis D virus

Definition    Return to top

Delta agent is a type of virus called hepatitis D that causes symptoms only in people who have a hepatitis B infection.

Causes    Return to top

Hepatitis D virus (HDV) is only found in people who carry the hepatitis B virus. HDV may make a hepatitis B infection or existing hepatitis B liver disease worse. It can cause symptoms in people with hepatitis B virus who never had symptoms.

Hepatitis D infects about 15 million people worldwide. It occurs in 5% of people with hepatitis B.

Risk factors include:

Symptoms    Return to top

Hepatitis D may make the symptoms of hepatitis B more severe.

Symptoms may include:

Exams and Tests    Return to top

Treatment    Return to top

Many of the medicines used to treat hepatitis B are not helpful for treating hepatitis D. See hepatitis B.

Persons with long-term HDV infection may receive a medicine called alpha interferon for up to 12 months. A liver transplant for end-stage chronic hepatitis B may be effective.

Outlook (Prognosis)    Return to top

Persons with an acute HDV infection usually get better over 2 to 3 weeks. Liver enzyme levels return to normal within 16 weeks.

About 10% of those who are infected may develop long-term (chronic) liver inflammation (hepatitis).

Possible Complications    Return to top

When to Contact a Medical Professional    Return to top

Call for an appointment with your health care provider if you have symptoms of hepatitis B.

Prevention    Return to top

Prompt recognition and treatment of hepatitis B infection can help prevent hepatitis D.

Avoid intravenous drug abuse. If you use IV drugs, avoid sharing needles.

A vaccine is available to prevent hepatitis B. It should be considered by people who are at high risk for hepatitis B infection.

References    Return to top

Dienstag JL. Chronic viral hepatitis. In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 6th ed. Philadelphia, Pa: Elsevier Churchill Livingstone;2005:chap 112.

Update Date: 2/21/2009

Updated by: George F. Longstreth, MD, Department of Gastroenterology, Kaiser Permanente Medical Care Program, San Diego, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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