Table 4.
Percentages of antibiotic resistant patterns of pathogens causing mastitis in farms with excessive and normal antibiotic use
| Antibiotics | CNS
|
Staph. aureus
|
Strep. uberis
|
Strep. dysgalactiae
|
||||
|---|---|---|---|---|---|---|---|---|
| NORM (n = 21) |
HIGH (n = 11) |
NORM (n = 13) |
HIGH (n = 4) |
NORM (n = 12) |
HIGH (n = 18) |
NORM (n = 7) |
HIGH (n = 3) |
|
| Oxytetracyclin | 4.8 | 10.0 | 30.8 | 0.0 | 25.0 | 16.7 | 50.0 | 66.7 |
| Cloxacillin | 4.8* | 10.0* | 15.4* | 25.0* | 8.3* | 22.2* | 0.0 | 0.0 |
| Oxacillin | 9.5 | 20.0 | 0.0 | 25.0 | 0.0 | 16.7 | 0.0 | 0.0 |
| Cephalexine | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 5.6 | 0.0 | 0.0 |
| Vancomycin | 4.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Gentamycin | 0.0 | 0.0 | 0.0 | 0.0 | 75.0 | 72.2 | 66.7 | 100.0 |
| Erythromycin | 9.5 | 0.0 | 0.0 | 0.0 | 0.0 | 5.6 | 0.0 | 0.0 |
| Neomycin | 0.0 | 10.0 | 0.0 | 0.0 | 91.7 | 77.8 | 100.0 | 100.0 |
| All antibioticsa | 23.8 | 45.5 | 38.5 | 25.0 | 91.7 | 88.9 | 100.0 | 100.0 |
| Resistances ≥2 antibiotics | 4.8 | 18.2 | 0.0 | 0.0 | 25.0 | 22.2 | 28.6 | 66.7 |
a
Resistant to at least one drug test.
*
Comparisons of specified bacteria between HIGH and NORM.