Reported risk behaviors or exposures among reported cases* of hepatitis A virus infection — United States, 2020

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Reported risk behaviors or exposures among reported cases* of hepatitis A virus infection — United States, 2020
Reported risk behaviors or exposures among reported cases* of hepatitis A virus infection — United States, 2020
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Source: CDC, National Notifiable Diseases Surveillance System.

* Reported confirmed cases. For the case definition, see Acute Hepatitis A.

† Reported cases may include more than one risk behavior/exposure. Case reports with at least one of the following risk behaviors/exposures reported 2–6 weeks prior to symptom onset or documented seroconversion if asymptomatic: 1) injection drug use; 2) sexual, household, or other contact; 3) men who have sex with men; 4) travel to hepatitis A-endemic region.

§ Cases with more than one type of contact reported were categorized according to a hierarchy: 1) sexual contact; 2) household contact (nonsexual); and 3) other contact with hepatitis A case.

¶ A total of 6,141 hepatitis A cases were reported among males in 2020.

Health departments might conduct investigations of newly reported hepatitis A cases to ascertain risk behaviors and exposures associated with infection. However, investigations might not be possible for all cases if patients are lost to follow-up or if health departments lack adequate resources for investigating all cases reported in their jurisdiction. Among the 9,952 case reports of hepatitis A received by CDC for 2020, data regarding risk behaviors or exposures were missing for 3,143 (31.6%) cases. At least one risk behavior or exposure was reported for 3,277 (32.9%) cases during the 2–6 weeks before illness onset.

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