Viral hepatitis surveillance United States, 2014
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      Revised 9/26/16: The counts and rates for acute hepatitis B have been updated.

      As part of the Centers for Disease Control and Prevention’s (CDC) National Notifiable Diseases Surveillance System (NNDSS) (1), viral hepatitis case-reports are received electronically from U.S. state and territorial health departments via CDC’s National Electronic Telecommunications System for Surveillance (NETSS), a computerized public health surveillance system that provides CDC with data on a weekly basis. Although the surveillance infrastructure was in place for states to report both acute and chronic infections, case-reports of chronic hepatitis B virus (HBV) and past or present hepatitis C virus (HCV) infections, which account for the greatest burden of disease, were not submitted by all states; in 2014, 40 states submitted reports of chronic HBV infection and 37 states submitted reports of chronic HCV infection.


      The NNDSS data in this report should be interpreted with the understanding that “reported cases” of viral hepatitis represent persons who were tested for and diagnosed with viral hepatitis infection based on a relatively stringent case definition. Because most infections with viral hepatitis are asymptomatic, all cases are not identified or reported. As a result, this Summary is most useful in detecting trends over time for newly reported cases of hepatitis A virus (HAV), HBV, and HCV infections. However, to account for under-ascertainment and under-reporting, an estimation method was developed in 2011 to better quantify the number of new cases of hepatitis A, B, and C from the actual number of cases reported for each disease (2). The estimates in this report were derived from this methodology. We therefore caution the reader that estimates before 2011, which were obtained using a different, unpublished methodology, cannot be compared with those from 2011 to the present.

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