non-endospore forming Gram-negative rods. In the laboratorySerratia are routinely isolated from bloodstream and wound sites using blood agar culture or from respiratory and urinary sites using selective culture methods. Common selective agar cultures include MacConkey agar which categorizes Serratia isolates with the other non-lactose fermenting Enterobacteriaceae or chromogenic agars, which classifies them into a broad Klebsiella, Enterobacter,Serratia and Citrobacter (KESC) grouping