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Is Hepatitis B Contagious?

hepatitis b virus

Unlike other infectious diseases for which vaccines have been developed and mandated in the U.S., hepatitis B is not common in childhood and is not highly contagious in the same way as chicken pox and pertussis. Hepatitis B is primarily an adult disease transmitted most frequently through blood but can also be transmitted through other body fluids such as semen and vaginal secretions. Hepatitis B is NOT transmitted through sneezing, kissing, sharing food or utensils or breastfeeding.1 In many cases, transmission may be asymptomatic.2

Those most at risk of hepatitis B include needle using drug addicts (illegal IV drug users); those who have sexual contact with a person infected with hepatitis B; sexually promiscuous heterosexual and homosexual adults; residents and staff of custodial institutions such as prisons; health care workers exposed to blood; hemodialysis patients, and infants born to infected mothers.3

Transmission of hepatitis B from infected mother to infant has always been uncommon and continues to be uncommon in the U.S., primarily due to routine prenatal screening of all pregnant women for hepatitis B infection, which, in many states, is required by law.4 Infants of mothers who are found to be positive for hepatitis B or whose hepatitis B status is unknown are treated by immunoprophylaxis with hepatitis B immune globulin (HBIG) to prevent transmission from mother to baby.5

IMPORTANT NOTE: NVIC encourages you to become fully informed about Hepatitis B and the Hepatitis B vaccine by reading all sections in the Table of Contents , which contain many links and resources such as the manufacturer product information inserts, and to speak with one or more trusted health care professionals before making a vaccination decision for yourself or your child. This information is for educational purposes only and is not intended as medical advice.

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1 CDC. Hepatitis B FAQs for Health Professionals: How is HBV transmitted? Revised Aug. 4, 2016.

2 CDC. Manual for the Surveillance of Vaccine-Preventable Diseases – Chapter 4: Hepatitis B. 6th Edition. 2013.

3 CDC. Hepatitis B FAQs for Health Professionals: Who is at risk for HBV infection? Revised Aug. 4, 2016.

4 CDC. Maternal Hepatitis B Screening and Reporting Requirements. Revised Sep. 14, 2014.

5 CDC. Viral Hepatitis – Hepatitis B Information – Perinatal Transmission. Revised Oct. 4, 2016.

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