Intrinsic antibiotic resistance

Enterobacterales

Organism	AMP	AMC	SAM	TIC	CFZ	FOX	CXM	IMI	TET	TGC	NIT	CST	AGs
Citrobacter freundii	R	R	R		R	R	R
Citrobacter koseri	R			R
Enterobacter cloacae	R	R	R		R	R
Escherichia coli
Hadnia alvei	R	R	R		R	R
Klebsiella aerogenes	R	R	R		R	R
Klebsiella pneumoniae Klebsiella oxytoca	R			R
Morganella morganii	R	R			R		R	r		R	R	R
Proteus mirabilis								r	R	R	R	R
Proteus vulgaris	R				R		R	r	R	R	R	R
Providencia rettgeri	R	R			R			r	R	R	R	R
Providencia stuartii	R	R			R			r	R	R	R	R	±
Raoultella species	R			R
Salmonella species Shigella species
Serratia marcescens	R	R	R		R	R	R				R	R
Yersinia enterocolitica	R	R		R	R

Non-Enterobacterales

Organism	AMP	PIP	TIC	SAM	AMC	TZP	CTX	CRO	CAZ	FEP	ATM	IMI	MEM	ETP	CST	AGs	TET/TGC	TMP	SXT	CHL	FOF
Acinetobacter baumannii	R				R						R			R				R		R	R
Burkholderia cepacia	R	R	R	R	R	±	±	±		±	±	±		R	R	±		±			R
Pseudomonas aeruginosa	R			R	R		R	R						R			R	R	R	R
Stenotrophomonas maltophilia	R	R	R	R	R	R	R	R			R	R	R	R		R	TET	R			R

Staphylococci

	NOVO	FOF	FA	AZT	CST	NAL
Staphylococcus aureus				R	R	R
Staphylococcus lugdenensis				R	R	R
Staphylococcus epidermidis				R	R	R
Staphylococcus haemolyticus				R	R	R
Staphylococcus saprophyticus	R	R	R	R	R	R
Staphylococcus capitis		R		R	R	R
Staphylococcus cohnii	R			R	R	R
Staphylococcus xylosus	R			R	R	R

Enterococcus

	Cephalosporins	VAN	TEC	AGs	CLI	Q-D	TMP	SXT	FA
Enterococcus faecalis	R			R	R	R	R	R	R
Enterococcus faecium	R			R	R		R	R	R
Enterococcus gallinarum	R	R		R	R	R	R	R	R
Enterococcus casseliflavus	R	R		R	R	R	R	R	R

• In vitro susceptibility but clinically ineffective: cephalosporins, aminoglycosides, clindamycin, and cotrimoxazole

Anaerobic Gram-Positive Bacilli

	VAN	AGs
Clostridium species		R
Clostridioides difficile		R
Clostridium innocuum	R	R

Anaerobic Gram-Negative Bacilli

	AGs	PEN	AMP	FQs
Bacteroides species	R	R	R
Fusobacterium canifelinum	R			R