E. coli Outbreak at Nagoya Costco Linked to Contaminated Food Products, Health Officials Confirm
A cluster of E. coli infections tied to a Costco warehouse in Nagoya, Japan, has prompted health authorities to issue warnings, according to the Nagoya Health and Welfare Bureau. At least five individuals have been reported ill, including a child in critical condition, though no fatalities have been confirmed, the bureau stated on April 5.
What Caused the Outbreak?

The outbreak is suspected to stem from contaminated food items sold at the Nagoya store, though the exact source remains under investigation. The health bureau identified the cases through laboratory testing, which confirmed the presence of E. coli O157:H7, a strain associated with severe gastrointestinal illness. “We are working with the facility to trace the affected products and ensure they are removed from circulation,” a bureau spokesperson said.
What Actions Has Costco Taken?
Costco Japan issued a statement on April 5, announcing the voluntary recall of specific meat and vegetable products sold at the Nagoya location. “We are cooperating fully with health authorities and have suspended sales of the affected items to prevent further illness,” the company said. The affected products include ground beef and pre-packaged leafy greens, according to a list provided by the retailer.
How Serious Is the Risk?
E. coli infections can cause symptoms ranging from diarrhea and abdominal cramps to life-threatening complications like hemolytic uremic syndrome (HUS), particularly in children and the elderly. The World Health Organization (WHO) emphasizes that proper food handling and cooking can prevent such outbreaks. “Consumers should avoid undercooked meat and wash produce thoroughly,” a WHO spokesperson noted.
What Precedents Exist for Similar Outbreaks?
This incident follows a 2022 E. coli outbreak in Osaka linked to contaminated sprouts, which sickened 40 people. Unlike that case, the Nagoya outbreak has not yet been tied to a specific supplier, according to the Japan Food Safety Commission. However, the agency has warned that large retail chains like Costco face heightened scrutiny due to their extensive distribution networks.
What Should Consumers Do?
Health officials advise individuals who purchased food from the Nagoya Costco between March 25 and April 5 to monitor for symptoms and contact local health centers if ill. “If you experienced vomiting, diarrhea, or fever after eating there, seek medical attention immediately,” the Nagoya bureau said.
Summary and Next Steps
The E. coli outbreak at Nagoya Costco underscores the ongoing challenges of food safety in large retail environments. As investigations continue, authorities are likely to emphasize stricter supply-chain audits. For now, consumers are urged to stay informed through official channels and exercise caution with packaged foods.
Nagoya Health and Welfare Bureau
Costco Japan
World Health Organization