Antimicrobial resistance of Pasteurella multocida type B isolates associated with acute septicemia in pigs and cattle in Spain

Table 3 MIC value distribution of Pasteurella multocida type B isolates derived from cattle (n = 18)

Break point	Ab	Number of isolates for each MIC (μg/mL)										MIC₅₀	MIC₉₀	%R
Break point	Ab	≤0.03	0.06	0.125	0.25	0.5	1	2	4	8	≥16	MIC₅₀	MIC₉₀	%R
≥1	ENR	16	1	0	0	1	0	0	0	0	0	≤0.03	0.06	0
≥8	CEF	16	0	1	0	0	1	0	0	0	0	≤0.03	0.125	0
> 8	GEN	1	0	0	1	0	0	10	6	0	0	2	4	0
≥32	C	0	0	0	0	17	1	0	0	0	0	0.5	0.5	0
> 2	LIN	0	0	0	0	0	0	1	0	6	11	≥16	≥16	94.4
≥1	PEN	1	10	1	1	4	1	0	0	0	0	0.06	0.5	5.6
≥8	OXY	2	2	1	10	3	0	0	0	0	0	0.25	0.5	0
≥8	TE	1	0	2	6	1	5	2	1	0	0	0.25	2,0	0
ND	ERY	0	0	1	6	3	0	0	0	0	8	0.5	≥16	ND
ND	NEO	0	1	0	0	1	0	0	14	2	0	0.4	8	ND

^a breakpoint reference value for tetracycline; ^b breakpoint value for P. multocida derived from dogs. Ab Antibiotic; C Chloramphenicol; CEF Ceftiofur; ENR Enrofloxacin; ERY Erythromycin; GEN Gentamicin; LIN Lincomycin; MIC Minimum inhibitory concentration; ND Non-determined value for P. multocida according to the Clinical and Laboratory Standards Institute (CLSI; 2013); NEO Neomycin; OXY Oxytetracycline; PEN Penicillin; TE Tetracycline

ISSN: 1746-6148