Katama Bay oyster farms have been closed for two weeks following three confirmed cases of Vibrio illness tied to oysters from the area.

While a new study on Vibrio looks at possible causes, from warming seas to increased demand, Vineyard growers are using various techniques to combat the bacteria during the hottest months.

As Katama Bay oyster farms remain closed because of Vibrio illness tied to raw oysters, scientists are using the bay as a testing ground to understand more about the bacteria and how it interacts with oysters.

Katama Bay oyster farms will remain closed for another week following additional confirmed cases of Vibrio illness tied to the area, a state Department of Marine Fisheries official said Tuesday afternoon. Chris Schillaci told oyster farmers that handling is not the problem.

Katama Bay oyster farms have been closed for a week because of three cases of confirmed cases of Vibrio parahaemolyticus illness tied to consumption of raw oysters from the area, state officials announced Wednesday.

With Vibrio an ongoing concern, guidelines for handling and transporting oysters are expected to be revised again. Vineyard oyster farmers have been exemplary in adhering to protocols, state officials said.