Table 5.

Percentages of antibiotic resistant patterns of staphylococci and streptococci, which both cause mastitis in farms with high and normal antibiotic use

Antibiotics	Staphylococci		Streptococcia		Both pathogensb
	NORM (n = 34)	HIGH (n = 15)	NORM (n = 19)	HIGH (n = 22)	NORM (n = 55)	HIGH (n = 37)
Oxytetracyclin	14.7	7.1	36.8	22.7	21.8	16.2
Cloxacillin	14.7	28.6	5.3	22.7	10.9**	27.0**
Oxacillin	5.9*	21.0*	0.0	13.6	3.6**	18.9**
Cephalexine	2.9	7.1	0.0	4.5	1.8	5.4
Vancomycin	2.9	0.0	0.0	0.0	1.8	0.0
Gentamycin	0.0	0.0	73.7	77.3	27.3*	45.9*
Erythromycin	5.9	0.0	0.0	4.5	3.6	2.7
Neomycin	0.0	7.1	94.7	81.8	34.5*	51.3*
All antibioticsc	29.4	40.0	94.7	90.9	52.7*	69.4*
Resistance ≥2 antibiotics	2.9	13.3	26.3	31.8	10.9	22.2

^aStreptococci including Strep. uberis, Strep. dysgalactia, and other streptococci.

^bPathogens including both staphylococci and streptococci

^cResistant to at least one drug test.

^*Differences between NORM and HIGH at p<0.05.

^**Differences between NORM and HIGH at p<0.05.