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It is indeed possible for P. mirabilis to be resistant to cefoxitin. The isolate may have a plasmid-mediated AmpC-type beta-lactamase. Yes, the isolate should be reported as cefoxitin resistant.
See the following reference:
Philippon,A., G Arlet, and GA Jacoby. 2002. (Minireview) Plasmid-determined AmpC-type beta-lactamases. Antimicrob Agents Chemother. 46:1-11.
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