Multistate Hepatitis A Outbreak Tied to Imported Frozen Clams

A hepatitis A outbreak spanning multiple states has been traced to frozen black clams imported from Ecuador, according to the CDC and FDA. The 37 confirmed cases, ranging in age from 6 to 40, were reported in Massachusetts, Minnesota, Pennsylvania and New York, with illness onset dates between July 30, 2025 and June 23, 2026. Hospitalizations total 30 and no fatalities have been recorded.

Interviews with patients revealed a high prevalence of raw or undercooked shellfish consumption, particularly black clams, a pattern that stood out against national dietary surveys. The implicated product, La Serranita concha negra clams, was recalled earlier in the year and linked to outlets in several northeastern states. Although recalls have been issued, the CDC and FDA continue to investigate, urging unvaccinated individuals who ate the clams within the past 14 days to consult health providers. The outbreak follows previous incidents of hepatitis A linked to imported shellfish, highlighting challenges in detecting low-level contamination in seafood.