Iranian pistachios previously imported to Canada need to be held and tested for salmonella before being sold, federal officials say.

The measure comes as federal health officials conduct an ongoing outbreak investigation that includes 155 lab-confirmed salmonella infections that have been identified across the country, with the actual number likely higher, given not everyone sickened seeks medical attention to get tested.

Of the cases, 24 people were hospitalized, with no deaths. People became sick between early March and mid-November.

A worker cleans pistachios after heating them in preparation for final roasting at a nut shop in Tehran in 2008. Heat may not kill salmonella in pistachios, Canadian authorities say. (Caren Firouz/Reuters)

Federal authorities advised consumers on Tuesd

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