Reported risk behaviors or exposures among reported cases* of Hepatitis A virus infection — United States, 2021

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Table 1.4 ▶
Reported risk behaviors or exposures among reported cases* of Hepatitis A virus infection — United States, 2021
The number of reported hepatitis A cases by availability of specific risk behavior or exposure in 2021. The categories listed in the first column are injection drug use, sexual contact, household contact (nonsexual), other contact, men who have sex with men, and international travel. The second column displays the number of case reports for which a risk was identified. The third column indicates the number of case reports for which no risk was identified. The fourth column includes the number of case reports for which risk information was missing.
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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 3,594 hepatitis A cases were reported among males in 2021.

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 3,026 (53%) cases that included information on injection drug use, 1,341 (44%) reported injection drug use.

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