TABLE 6.

Antibiotic sensitivities of recurrent and sporadic strains from raw milk and nondairy foods

Antibiotic	Sensitivitya
	Raw-milk strains		Food strains
	Recurrent	Sporadic	Recurrent	Sporadic
Ampicillin	<0.125–0.25	0.125–0.5	0.125–0.5	0.125–0.5
Gentamicin	<0.25–0.5	<0.25–1.0	0.25–0.5	0.25–2.0
Tetracycline	0.5–1.0	0.5–64.0	0.5–1.0	0.5–1.0
Streptomycin	4.0	2.0–4.0	4.0	2.0–4.0
Kanamycin	1.0–2.0	<1.0–4.0	1.0–2.0	1.0–8.0
Erythromycin	0.125–0.25	0.25	<0.125–0.25	0.25
Chloramphenicol	4.0	4.0	4.0	4.0
Cephalothin	2.0–4.0	2.0–4.0	2.0–4.0	2.0–4.0
Rifampin	<0.125	<0.125–0.25	<0.125	<0.125

^aRange of MICs (micrograms per milliliter).