TABLE 2.

Antibiotic resistance of Salmonella enterica serovars and STEC O157 isolated from animals in human-animal contact areas at AZA-accredited zoological parks against 11 antimicrobials^a as determined by disk diffusion

Zoo	Animal	Salmonella enterica serotype (serogroupb) or E. coli	Antibiotic resistance profile
3	Goat	Serotype Infantis (C1)	Ampicillin
8	Yak	STEC O157:H7	Ampicillin
18	Horse	Serotype Javiana (D1)	Ampicillin, azithromycin
29	Goat	Serotype Newport (C2)	Ampicillin, tetracycline, azithromycin
29	Giraffe	Serotype Rubislawc	Ampicillin, tetracycline
36	Goat	Serotype Rubislawc	Ampicillin, tetracycline, streptomycin, azithromycin
36	Zebu calf	Serotype Javiana (D1)	Ampicillin, tetracycline
		Serotype Muenchen (C2)d	Ampicillin, tetracycline

^aAntimicrobials and their levels in disks (in micrograms) were as follows: ampicillin, 10; chloramphenicol, 30; streptomycin, 10; sulfisoxazole, 300; tetracycline, 30; trimethoprim, 5; ceftiofur, 30; ciprofloxacin, 5; gentamicin, 10; neomycin, 30; and azithromycin, 15.

^bSerogroup as determined with anti-Salmonella serogroup B, C1, C2-C3, D1, and E1 and anti-E. coli O157 and H7 monoclonal antibodies by enzyme immunoassay.

^cIsolate nonreactive with anti-Salmonella serogroup B, C1, C2-C3, D1, and E1 monoclonal antibodies by enzyme immunoassay; serotype Rubislaw belongs to serogroup F.

^dIsolated on repeat fecal sampling while the zebu calf was quarantined 2 weeks after initial isolation of serotype Javiana.