As holiday baking season begins, federal health agencies are warning Canadians that an investigation into salmonella-contaminated pistachios is still ongoing.

Since March, 155 people have been reported sick with the bacterial illness after eating various brands of pistachios and pistachio-containing products, some as recently as November.

That includes 24 people who were hospitalized.

The Public Health Agency of Canada, the Canadian Food Inspection Agency and Health Canada say there have been more than 160 recalls and they are linked to pistachios imported from Iran.

It says that while nuts from other countries aren't affected, it's not always easy to determine the country of origin.

They are encouraging Canadians to check their cupboards for pistachios, which have a long shelf life,

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