Hepatitis A outbreak linked to Ecuadorian black clams

A Hepatitis A outbreak linked to frozen black clams imported from Ecuador has sickened at least 37 people across four U.S. states: Massachusetts, Minnesota, New York, and Pennsylvania. The investigation by the CDC and FDA has identified La Serranita brand concha negra (black shell) meat as the source. The product is typically used in ceviche, a dish where the citrus juice used does not kill viruses like heat does.

The outbreak has a long timeline, with illness onset dates ranging from July 30, 2025, to June 23, 2026. The hospitalization rate is notably high, with 30 of the 37 reported cases requiring hospital care. While no deaths have been reported, the virus attacks the liver and is highly contagious.

FDA warnings regarding the product were initially issued in April, specifically noting distribution in New York and New Jersey, but have since expanded to include Connecticut, Ohio, and other regions. Investigators found that 77 percent of interviewed patients had eaten ceviche, and 47 percent specifically identified raw or undercooked black clams as part of their recent diet.