Smoked salmon tainted with salmonella bacteria has sickened hundreds of people in the United States and in the Netherlands, sparking a major recall, health authorities said Tuesday.
The National Institute for Public Health and the Environment said the salmon has been traced to the Dutch company Foppen, which sells to Costco.
The institute said in a statement that around 200 people -- and likely more -- in the Netherlands and more than 100 people in the United States have been sickened by a strain of the bacteria called Salmonella Thompson.
However, Costco, the company that sells the salmon in the U.S., said it had no reports of illness.
Foppen also estimated the number of infections was higher.
Company spokesman Bart de Vries said that since the company set up a public information phone line two days ago, some 1,400 people had called and around 350 of the callers "reported symptoms consistent with a salmonella infection."
Those infected by the salmonella bacteria can suffer symptoms including fever, vomiting and diarrhea.
De Vries said that in the United States the company sells only to wholesaler Costco and that Costco would deal with any U.S. recall. It was not immediately clear how much contaminated fish had been sold in America.
Roel Vincken of the Dutch Food and Consumer Product Safety Authority, which carried out tests confirming the salmonella outbreak, said he had no information on a U.S. recall.
Costco got a call from Foppen regarding the recall late Monday afternoon, said Craig Wilson, vice president of food safety at Costco Wholesale Corp.
He said Costco immediately pulled the items from shelves and blocked its sale in stores, meaning the products won't scan at registers.
The smoked salmon was sold under the Foppen name, as well as under Costco's store-brand name, Kirkland.
Customers who purchased the items will be called by the company to notify them of the recall, Wilson said. The calls will be followed up with a letter.
Wilson said Costco's independent testing of the smoked salmon hasn't yet turned up any positive results for salmonella. He said the company has not received any reports of illnesses.
Harald Wychgel, a spokesman for the Dutch public health institute, said the institute got its information on Americans becoming ill from the U.S. Centers for Disease Control and Prevention.
De Vries said Foppen did not believe contaminated fish had been sold to any other countries.
Foppen, which processes fish in the Netherlands and at a factory in Greece, is investigating the cause of the outbreak.
"The investigation into the cause is under way and has been narrowed down to one production line at one factory (in Greece)," De Vries told The Associated Press. "We can't yet say what the cause of the infection was.
Foppen has halted all production of smoked salmon until the investigation is completed, he added.