The CDC is investigating a multistate outbreak of human Salmonella serotype Typhimurium infections due to contact with water frogs including African Dwarf Frogs. Water frogs commonly live in aquariums or fish tanks. Amphibians such as frogs and reptiles such as turtles, are recognized as a source of human Salmonella infections. In the course of routine assessment, a number of cases with the same strain have been identified over many months.

As of December 7, 2009, 48 individuals infected with the outbreak strain of Salmonella Typhimurium have been reported from 25 states. The number of ill persons identified in each state is as follows: Arizona (1), California (2), Colorado (2), Florida (1), Georgia (1), Idaho (1), Illinois (5), Kentucky (1), Louisiana (1), Massachusetts (2), Maryland (2), Michigan (3), Minnesota (1), Missouri (2), Mississippi (1), New Jersey (2), New Mexico (1), New York (1), Ohio (2), Pennsylvania (3), Tennessee (2), Texas (3), Utah (6), Virginia (1), and Washington (1).

Among the persons with reported dates available, illnesses began between June 24, 2009 and November 14, 2009. Infected individuals range in age from <1 year old to 54 years old. Seventy-seven percent (77%) of patients are younger than 10 years old and the median age is 4 years. Fifty-five percent (55%) of patients are female. No deaths have been reported.