Table 7.

Antimicrobial drugs used to treat respiratory disease and diarrhea in preweaned calves after January 1, 2017 on California dairies.

First choice antimicrobial drug			Second choice antimicrobial drug
Respiratory disease (n = 49)	Number of respondents	Percent	Respiratory disease (n = 33)	Number of respondents	Percent
Ampicillin	1	2.0	Ampicillin	1	3.0
Ceftiofur	8	16.3	Enrofloxacin	5	15.2
Enrofloxacin	4	8.2	Enrofloxacin and Florc	2	6.1
Florfenicol	21	42.9	Florfenicol	8	24.2
Gamithromycin	2	4.1	Oxytetracycline	2	6.1
Oxtetracycline	4	8.2	Penicillin	2	6.1
Penicillin	1	2.0	Tildipirosin	1	3.0
Tildipirosin	1	2.0	Tilmicosin	1	3.0
Tulathromycin	5	10.2	Tulathromycin	11	33.3
Tylosin	1	2.0
None*	1	2.0
Diarrhea (n = 45)			Diarrhea (n = 17)
Adsorbent*	1	2.2	Ceftiofur	3	17.7
Ampicillin	4	8.9	Enrofloxacin	2	11.8
Ceftiofur	3	6.7	Florfenicol	1	5.9
Enrofloxacin	1	2.2	Oxytetracycline	2	11.8
Florfenicol	1	2.2	Penicillin	2	11.8
Neomycin	2	4.4	Sulfonamide	3	17.7
Oxytetracycline	1	2.2	Tulathromycin	1	5.9
Penicillin	1	2.2	Penicillin and Ceftiofur	1	5.9
SMZ/Bismuth/Charcoal*	1	2.2	Ampicillin	1	5.9
Salt solutions*	3	6.7	Othersb,*	1	5.9
Spectinomycin	2	4.4
Sulfamethoxazole	1	2.2
Sulfonamide and Ceftiofur	1	2.2
Sulfonamide	11	24.4
Othersa,b*	12	26.7

The first and second choice antimicrobial drugs (AMD) used to treat respiratory disease and diarrhea are shown as number of respondents who answered that they used this specific AMD.

^aBismuth subsalicylate,

^bivermectin,

^cEnrofloxacin and Florfenicol.

^*Non-antimicrobial compounds.