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You might want to pass on the oysters at your next happy hour: the bivalves can bring on norovirus, otherwise known as the stomach flu, according to a new study.

The study, published last month in the journal Applied and Environmental Microbiology, looked at the DNA of 1,077 samples of norovirus in oysters. The results: 80% of documented human noroviruses saw a match in the oysters, most of which were found along coasts contaminated by human sewage. More unsettling, oysters act as a incubator for the virus to mutate between outbreaks. Raw oysters seem to be especially dangerous transmitters.

Norovirus is the cause of one stomach flu, one of the world’s most common illnesses. Highly infectious and often painful, the virus can debilitate a victim for a few days but can be fatal in infants, older adults and others with sensitive immune systems.

Norovirus has been traced to people who work with food not washing their hands, and a “vomiting machine” designed recently by scientists at North Carolina State illustrated that droplets of infected vomit can also fly through the air and infect people the way a sneeze or cough might.

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