Drake’s Bay Oyster Company has instituted a voluntary recall of certain shucked and unshucked oysters it suspects may be carriers of Vibrio parahaemolyticus, a naturally occurring bacteria that can cause stomach distress and, occasionally, serious illness. The affected shucked oysters are labeled with lot numbers 363 through 421. The affected in-shell raw oysters were harvested between July 17 and August 8. To date, three illnesses have been linked to the products. The bacteria was also suspected in Tomales Bay last year when Marin Oyster Company, a wholesale operation based in Marshall, recalled some of its oysters and mussels harvested in October. Additionally, on August 9, Tomales Bay Foods Inc. voluntarily recalled 133 pounds of two types of cheese, Shepard’s Way “Big Woods Blue” made between July 19 and 27, and Tumalo Farms “Pondhopper” packed on April 25. The company suspects those cheeses may be contaminated with Listeria monocytogenes, a common food-borne pathogen. No illnesses have ben linked to the products so far.