NEW : Salmonella outbreak has sickened 475 says FDA . The CDC is investigating the source of a salmonella-tainted burger sold at two California restaurants and one in New York City. Brand-name peanut butters are not expected to be affected . Peanut Corp. 's Blakely , Georgia , plant were found to contain the bacteria , although a direct link to the strain that has now sickened 474 people in 43 states has not been found . FDA urges manufacturers to announce whether they use certain products .
NEW : Salmonella outbreak has sickened 475 says FDA . The CDC is investigating the source of a salmonella-tainted burger sold at two California restaurants and one in New York City. Brand-name peanut butters are not expected to be affected . FDA urges manufacturers to announce whether they use certain products .