Research Article

Antibiotic and Disinfectant Susceptibility Patterns of Bacteria Isolated from Farmed Fish in Kirinyaga County, Kenya

Table 2

Antibiotic susceptibility patterns and overall antibiotic responses for the bacterial isolates, pegged on CLSI’s inhibition zones interpretive criterion.

Bacterial isolatesPatternNumber of isolates susceptible or resistant, n (%), to the antibiotic agents tested
AMPTETCOTSKGENSXC

A. hydrophila (N = 6)S0 (0)5 (83)4 (67)6 (100)6 (100)6 (100)6 (100)6 (100)
R6 (100)1 (17)2 (33)0 (0)0 (0)0 (0)0 (0)0 (0)

Proteus spp. (N = 6)S0 (0)2 (33)0 (0)6 (100)6 (100)6 (100)3 (50)3 (50)
R6 (100)4 (67)6 (100)0 (0)0 (0)0 (0)3 (50)3 (50)

K. pneuzmoniae (N = 7)S6 (86)5 (71)5 (71)7 (100)7 (100)7 (100)7 (100)7 (100)
R1 (14)2 (29)2 (29)0 (0)0 (0)0 (0)0 (0)0 (0)

C. freundii (N = 6)S5 (83)6 (100)5 (83)5 (83)6 (100)6 (100)6 (100)6 (100)
R1 (17)0 (0)1 (17)1 (17)0 (0)0 (0)0 (0)0 (0)

Salmonella enteritidis (N = 4)S2 (50)4 (100)0 (0)4 (100)4 (100)4 (100)4 (100)4 (100)
R2 (50)0 (0)4 (100)0 (0)0 (0)0 (0)0 (0)0 (0)

Streptococcus spp. (N = 3)S0 (0)2 (67)0 (0)0 (0)1 (33)3 (100)1 (33)3 (100)
R3 (100)1 (33)3 (100)3 (100)2 (67)0 (0)2 (67)0 (0)

P. aeruginosa (N = 5)S0 (0)4 (80)0 (0)5 (100)5 (100)5 (100)0 (0)0 (0)
R5 (100)1 (20)5 (100)0 (0)0 (0)0 (0)5 (100)5 (100)

E. coli (N = 3)S2 (67)3 (100)0 (0)3 (100)3 (100)3 (100)3 (100)3 (100)
R1 (33)0 (0)3 (100)0 (0)0 (0)0 (0)0 (0)0 (0)

S. marcescens (N = 6)S0 (0)6 (100)0 (0)4 (67)4 (67)6 (100)4 (67)6 (100)
R6 (100)0 (0)6 (100)2 (33)2 (33)0 (0)2 (33)0 (0)

Micrococcus spp. (N = 2)S2 (100)2 (100)0 (0)2 (100)2 (100)2 (100)2 (100)2 (100)
R0 (0)0 (0)2 (100)0 (0)0 (0)0 (0)0 (0)0 (0)

Overall antibiotic response (N=48)S17 (35)39 (81)14 (27)42 (88)44 (92)48 (100)36 (75)40 (83)
R31 (65)9 (19)34 (73)6 (12)4 (8)0 (0)12 (25)8 (17)

S: susceptible, R: resistance, n: number of isolates, AMP: ampicillin, TET: tetracycline, COT: co-trimoxazole, S: streptomycin, K: kanamycin, GEN: gentamicin, SX: sulphamethoxazole, C: chloramphenicol.