Gram negative organisms, usually "SPICEM" (see additional information), that have a chromosomal beta-lactamase
Most AmpC organisms are nosocomially encountered, are GI flora and are part of the Enterobacteriaceae family
ESBLs vs. ampC: Most ESBLs are plasmid-encoded, whereas ampCs are usually inducible and chromosomal.
In the lab, ampCs test resistant to cefoxitin and cefotetan.
SPICEM stands for Serratia, Providencia, (Indole positive) Proteus vulgaris, Citrobacter, Enterobacter, and Morganella
