AmpC Organisms


See 'Additional Information'
See 'Additional Information'

General Information

Pathogen information

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.

Associated syndromes

Syndromes caused by the organism that possesses AmpC (see individual organism).

Additional Information

May require contact precautions if highly resistant.

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.

They test susceptible to aztreonam.

SPICEM stands for Serratia, Pseudomonas and Providencia, (Indole positive) Proteus vulgaris, Citrobacter, Enterobacter, and Morganella