High heat, low tide likely triggering spike in Vibrio parahaemolyticus illnesses from shellfish-linked infections

The Washington State Health Department reported an outbreak of vibriosis in the state. The state has initiated a recall of live oysters harvested from the Samish Bay growing area due to multiple cases of Vibrio parahaemolyticus illnesses associated with oysters harvested in the area.  The outbreak has already surpassed the highest number of cases ever recorded by the state for July. The state reported 52 lab-confirmed cases, of which 46 were foodborne Vibrio parahaemolyticus cases. In 2020 there were only 5 cases, and in 2018 there were a high number of 25 cases. Recent high temperatures and low tides in Washington State are likely to blame for the increased rate of illness associated with eating raw or undercooked shellfish, especially oysters that are contaminated with Vibrio.  “Another effect of the recent heatwave is the perfect storm of conditions for Vibrio infections. It’s important that when enjoying shellfish, we follow simple steps to stay healthy,” said Todd Phillips, Director of the Office of Environmental Health and Safety.@ https://www.doh.wa.gov/Newsroom/Articles/ID/2867/