TABLE 1.

Patterns of antibiotic resistance of fecal streptococci from known sources

Drug and concn (μg/ml)	% Resistant isolates from each sourcea
	Beef cows (n = 1,398)	Chickens (n = 824)	Dairy cows (n = 728)	Deer (n = 1,245)	Humans (n = 1,579)	Waterfowl (n = 1,284)
Chlortetracycline
40	1	90	17	0	78	1
60	0	68	8	0	39	0
Erythromycin
7	1	89	4	0	90	1
15	0	77	0	0	76	0
Neomycin
10	2	100	100	0	54	0
40	0	98	88	0	4	0
Oxytetracycline
10	90	100	100	38	98	97
30	80	100	88	0	84	45
60	12	100	81	0	56	5
100	0	95	76	0	14	0
Streptomycin
10	96	100	100	59	100	97
30	73	96	96	2	96	79
45	25	89	50	2	91	31
60	3	73	20	0	82	12
100	1	65	1	0	25	0
Tetracycline
15	81	100	80	0	87	2
30	13	100	79	0	81	1
100	0	98	67	0	12	0

^an, total number of isolates from each source.