Since an outbreak began last August, 376 people in Michigan have contracted the sometimes fatal illness. It's mainly spread person-to-person via contact with feces.
Angela Minicuci is with the Michigan Department of Health and Human Services.
"We haven't found one contaminated food source or exposure at this point," she says, "but we are seeing a lot of relation to people who are using opioids or drugs."
People who are, or have been incarcerated, are also considered at higher risk of getting hepatitis A, as are homeless people. A staggering 86% of those who've gotten hepatitis A in the state since last year have been hospitalized. Fourteen people have died.