The U.S. Centers for Disease Control and Prevention (CDC) has confirmed 37 cases of hepatitis A linked to imported frozen clams across four states, with 30 hospitalizations reported and no deaths. The outbreak spans Massachusetts, Minnesota, New York, and Pennsylvania, with illness onset dates ranging from June 30, 2025, to June 23, 2026. The CDC warns the true number of cases may be higher due to underreporting.
Investigation Details and Food Exposures
Public health officials interviewed affected individuals about their food consumption in the 15 to 50 days before illness onset. Among those interviewed:
- 77% reported eating ceviche (raw fish or shellfish marinated in citrus juice).
- 76% consumed raw or undercooked shellfish.
- 47% ate raw or undercooked black clams (concha negra).
These percentages were significantly higher than national averages for shellfish consumption, according to the CDC’s FoodNet Population Survey. The agency stated that imported frozen clams may have been contaminated with the hepatitis A virus, though traceback investigations are ongoing to identify the exact source.
Recalled Products and Geographic Spread
The FDA issued a recall for La Serranita-brand concha negra (black shell) fresh frozen clams from Ecuador in April 2026. The recalled products were distributed to restaurants and retailers in Connecticut, Massachusetts, New Jersey, New York, Ohio, and Pennsylvania. The recall followed earlier announcements in New York and New Jersey.
Demographics and Public Health Response
The affected individuals ranged in age from 6 to 40 years old. The CDC emphasized that hepatitis A is a vaccine-preventable disease and recommended vaccination for unvaccinated individuals who may have been exposed. Health officials continue to monitor the situation as additional cases may be identified in other states.
The CDC has not yet confirmed the exact origin of the contamination but noted that the outbreak investigation remains active. No deaths have been reported, and health authorities are urging the public to avoid consuming raw or undercooked shellfish, particularly imported frozen clams, until further guidance is issued.