What to know
CDC, the US Food and Drug Administration (FDA), and public health officials in several jurisdictions investigated a multistate hepatitis A outbreak potentially linked to imported frozen clams. The outbreak investigation is closed. During July 2025 – October 2026, a foodborne hepatitis A outbreak impacted people in four states: Massachusetts, Minnesota, New York, and Pennsylvania.
When people got sick
The chart below shows when people got sick during this hepatitis A outbreak. The true number of sick people was likely higher than the number reported, since some people recover without medical care and are not tested for hepatitis A.
*n=37 for whom information was reported as of October 1, 2026.
This page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.
The information on this page was last reviewed by subject matter experts to ensure accuracy.