Gouda cheese from Bravo Farms sold in Costco between October 5th and November 1st has reportedly sickened twenty-five people with E.coli. The cheese was sold at Costco stores in Arizona, California, Colorado, New Mexico and Nevada.
According to the FDA, no deaths have been reported. They suggest that if you have purchased Gouda cheese from Costco during this period and you are in one of the affected five states, you should either put the cheese in a plastic bag and dispose of it in a sealed trash can (not sure how that stops the spread of the bacteria when the trash gets taken to the heap, however!).
You may also return the cheese to the store; Costco is offering refunds to those who return the cheese.