ATLANTA (AP) -- Half the meat and poultry sold in the supermarket may be tainted with the staph germ, a new report suggests. The new estimate is based on just 136 samples of beef, chicken, pork and turkey purchased from grocery stores in Chicago, Los Angeles, Washington, D.C., Flagstaff, Ariz. and Fort Lauderdale, Fla. Proper cooking kills the germs, and federal health officials estimate staph accounts for less than 3 percent of foodborne illnesses, far less than more common bugs like salmonella and E. coli.