What to know
In 2016, hepatitis A outbreaks began spreading across the United States through person-to-person transmission. The outbreaks peaked in 2019.

Content Source:
Division of Viral Hepatitis
- "Outbreak-associated" status is currently determined at the state level in accordance with each state's respective outbreak case definition.
- Outbreak-related hepatitis A deaths are defined at the state level in accordance with each state's respective hepatitis A-related death definition. Some states are reviewing death certificates on a regular basis to actively find hepatitis A-related deaths, while other states are utilizing passive surveillance.
- Outbreak start date is defined at the state level and may represent the earliest onset date of an outbreak case (AZ, AR, KS, UT), the left censor date for which cases are considered part of the outbreak based on the state outbreak case definition (AL, CA, CO, DE, FL, GA, ID, IL, IN, KY, LA, ME, MD, MA, MI, MN, MS, MO, NV, NH, NJ, NC, OH, PA, SC, TN, TX, VA, WA), or when a state declared a hepatitis A outbreak (NM, WV).