The US Food and Drug Administration (FDA) has taken action in response to reports from the Canadian Food Inspection Agency (CFIA) of a norovirus outbreak linked to the consumption of oysters. The contaminated oysters were sold between January 16 and February 17 this year, and there is concern that some may still be frozen in the supply chain. The outbreak, which occurred in Deep Bay, Baynes Sound in British Columbia, Canada, has made many people ill. The FDA is working with the CFIA to investigate the cause of the outbreak.