Antibiotic Resistance in Staphylococcus aureus and Coagulase Negative Staphylococci Isolated from Goats with Subclinical Mastitis

Table 2

Antimicrobial susceptibility of $S.\mathrm{\hspace{0.17em}\hspace{0.17em}}aureus$ and $CNS$ strains isolated from goats subclinical mastitis.

		S. aureus						CNS
Antimicrobial	MIC ($\mu$g/mL)	Susceptible		Intermediate		Resistant		Susceptible		Intermediate		Resistant
agents	breakpoints	$n$	%	$n$	%	$n$	%	$n$	%	$n$	%	$n$	%
Ampicillin ${}^{(\text{a})}$	$\le$0.25–$\ge$0.5	22	88.0	–	–	3	12.0	48	64.0	–	–	27	36.0
Cefoperazone ${}^{(\text{b})}$	$\le$16.0–$\ge$64.0	25	100.0	–	–	–	–	74	98.7	1	1.3	–	–
Ceftriaxone ${}^{(\text{b})}$	$\le$8.0–$\ge$64.0	23	92.0	2	8.0	–	–	73	97.3	1	1.3	1	1.3
Cephalothin ${}^{(\text{a})}$	$\le$8.0–$\ge$32.0	24	96.0	–	–	1	4.0	74	98.7	1	1.3	–	–
Cloxacillin ${}^{(\text{a})}$	$\le$2.0–$\ge$4.0	25	100.0	—	—	–	–	73	97.3	—	—	2	2.7
Kanamycin ${}^{(\text{a})}$	$\le$16.0–$\ge$64.0	15	60.0	3	12.0	7	28.0	59	78.7	11	14.7	5	6.7
Novobiocin ${}^{(\text{c})}$	$\le$4.0	25	100.0	—	—	–	–	73	97.3	—	—	2	2.7
Ofloxacin ${}^{(\text{b})}$	$\le$1.0–$\ge$4.0	23	92.0	2	8.0	–	–	71	94.7	1	1.3	3	4.0
Oxytetracycline ${}^{(\text{a})}$	$\le$4.0–$\ge$16.0	21	84.0	–	–	4	16.0	71	94.7	–	–	4	5.3
Vancomycin ${}^{(\text{a})}$	$\le$4.0–$\ge$32.0	25	100.0	–	–	–	–	75	100.0	–	–	–	–

${}^{(\text{a})}$Breakpoints NCCLS, [19];$\mathrm{\hspace{0.17em}\hspace{0.17em}}{}^{(\text{b})}$= breakpoints CLSI, [20];$\mathrm{\hspace{0.17em}\hspace{0.17em}}{}^{(\text{c})}$= breakpoint [21].