Abstract
We report the case of a pediatric patient with a Salmonella enterica serotype Infantis infection. Detailed microbiological investigation revealed that this isolate carries four β-lactamase genes (blaTEM-1B variant, blaSHV-5, blaCTX-M-15,and blaCMY-2) conferring resistance to all ß-lactams but imipenem. This is the first report of a Salmonella isolate with CTX-M and AmpC enzymes on the American continent, the first report of blaCMY-2 in Salmonella serotype Infantis, and the first report of blaCTX-M-15 in the genus Salmonella.