CDC is collaborating with public health and agriculture officials in many states and the U.S. Department of Agriculture’s (USDA) National Poultry Improvement Plan (NPIP) to investigate a multistate outbreak of human Salmonella serotype Altona infections. As of May 25, 2011, a total of 25 individuals infected with the outbreak strain of Salmonella Altona have been reported from 11 states. The number of ill persons identified in each state is as follows: Indiana (1), Kentucky (3), Maryland (2), Minnesota (1), North Carolina (4), New York (1), Ohio (7), Pennsylvania (2), Tennessee (2), Virginia (1), and Vermont (1).