Technical Abstract: A Salmonella outbreak investigation identified a frozen feeder rodent facility (Supplier A) served as the vector of a pathogenic Salmonella strain for pet snakes and humans. From Supplier A, seven Salmonella positive samples out of 45 environmental swabs were found, and only one adult mouse out of 88 frozen feeder rodents were Salmonella-positive by culture. No Salmonella strains were isolated from rodent feed. The pulsed-field gel electrophoresis (PFGE) subtype patterns of Salmonella Typhimurium isolates from feeder rodent and environment samples were indistinguishable from the outbreak strain isolated from humans. A follow-up investigation was performed on all the additional feeder rodent facilities identified in Texas. A Salmonella serotype was isolated at one of four facilities and seven of 100 rodent samples were positive for Salmonella at this facility. The strain S I 4,[5],12:i:- was isolated from seven feeder rodent samples and PFGE patterns of the seven isolates were indistinguishable. As was observed in the initial outbreak investigation, no Salmonella were cultured from rodent feed at any of the facilities. The feeder rodent industry is an insufficiently recognized industry in the United States. Outbreak investigation and testing of additional feeder rodent facilities indicate that in Texas further evaluation of feeder rodent facilities as a source of Salmonella for pet snakes and humans is warranted.