Researchers with the BC Centre for Disease Control may have pinpointed how a mysterious norovirus outbreak spread, forcing the closure of 13 West Coast oyster farms and curtailing operations at others as hundreds of Canadians fell ill.

British Columbia's shellfish industry is reeling from the impact of a mysterious norovirus that has forced the closure of seven coastal oyster farms, caused others to curtail operations and made hundreds of Canadians sick.

Brace yourselves, oyster lovers: there's a chance they were contaminated with sewage.