Complex sentence: One epidemic of "Salmonella enterica" I 4,5,12:i:-in the United States in February of 2012 affected 46 people spanning 22 states and seemed to be linked to the handling of live or frozen feeder mice and rats for reptile and amphibian pets.
Split into simpler sentences: One epidemic of "Salmonella enterica" I 4,5,12:i:-in the United States in February of 2012 affected 46 people across 22 states. The outbreak seemed to be linked to the handling of live or frozen feeder mice and rats for reptile and amphibian pets.