The Massachusetts Department of Public Health (MDPH) has reported 318 cases of acute hepatitis A virus (HAV) outbreak infections since April 2018. Four deaths have been recorded.
The individuals most affected in this outbreak include those with recent experience homelessness and unstable housing (50%), and/or substance use disorder (Injection drug use -75%/Any illicit drug use –89%).
Two-thirds of the outbreak cases had a co-infection with hepatitis C.
A full 50 percent of the outbreak cases are from two counties: Suffolk and Worcester.

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