Table 2.
Diversity of antimicrobial resistance phenotypes in Salmonella isolated from two commercial poultry farms.
| Antimicrobial resistance phenotypesa | Strain typeb | Totalc | ||
|---|---|---|---|---|
| STR | 5 | 41 | (36.28) | |
| STR SMX GEN | 5 | 17 | (15.04) | |
| SMX TMS TET | 4 | 11 | (9.73) | |
| STR SMX GEN TET | 3 | 8 | (7.08) | |
| STR SMX TMS TET | 5 | 7 | (6.19) | |
| STR SMX | 2 | 3 | (2.65) | |
| STR SMX GEN TMS TET | 2 | 3 | (2.65) | |
| CHL | 2 | 2 | (1.77) | |
| STR SMX GEN CEP | 1 | 2 | (1.77) | |
| STR TET CHL | 1 | 2 | (1.77) | |
| TET | 2 | 2 | (1.77) | |
| TET CEP CHL | 2 | 2 | (1.77) | |
| AMP | 1 | 1 | (0.88) | |
| STR SMX CEP | 1 | 1 | (0.88) | |
| STR SMX AXO FOX TIO AMI APR NAL | 1 | 1 | (0.88) | |
| STR SMX GEN AMP | 1 | 1 | (0.88) | |
| SMX GEN | 1 | 1 | (0.88) | |
| STR GEN | 1 | 1 | (0.88) | |
| STR SMX GEN TET AMP | 1 | 1 | (0.88) | |
| SMX TET TMS CEP CHL KAN | 1 | 1 | (0.88) | |
| STR SMX TET TMS CHL | 1 | 1 | (0.88) | |
| CEP AMP | 1 | 1 | (0.88) | |
| SMX TMS | 1 | 1 | (0.88) | |
| TMS TET | 1 | 1 | (0.88) | |
| SMX | 1 | 1 | (0.88) | |
| “STR SMX” alone or with another antimicrobial resistance | 47 | (41.59) | p < 0.05d | |
| “STR SMX GEN” alone or with another antimicrobial resistance | 32 | 28.32% | p < 0.05e | |
| Diversity (Reciprocal Simpson’s Index) = 1.20 | ||||
| Evenness = 0.26 | ||||
aResistance profiles to the following antibiotics: AMP, ampicillin; AUG, augmentin; FOX, cefoxitin; CEP, cephalothin; GEN, gentamicin; KAN, kanamycin, STR, streptomycin; AMI, amikacin; NAL, nalidixic acid; TET, tetracycline; SMX, sulfadimethoxine; TMS, trimethoprim/sulfamethoxazole; and CHL, chloramphenicol.
bNumber of different S. enterica serovar or strain type with antimicrobial resistance phenotype.
c( ) Percentage of total antimicrobial resistance phenotypes identified.
dLinkage of STR with SMX as determined by the chi-squared test.
eLinkage between STR and SMX with GEN as determined by the chi-squared test.