Antimicrobial resistance of Escherichia coli isolated in newly-hatched chickens and effect of amoxicillin treatment during their growth
The use of antimicrobials in food animals is the major determinant for the propagation of resistant bacteria in the animal reservoir. However, other factors may also play a part, and in particular vertical spread between the generations has been suggested to be an important transmission pathway....
| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | Inglés |
| Publicado: |
Taylor & Francis
2020
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.11939/6796 https://www.tandfonline.com/doi/full/10.1080/03079457.2016.1168515 |
| Sumario: | The use of antimicrobials in food animals is the major determinant for the propagation of
resistant bacteria in the animal reservoir. However, other factors may also play a part, and in
particular vertical spread between the generations has been suggested to be an important
transmission pathway. The objective of this paper was to determine the resistance patterns
of Escherichia coli isolated from newly-hatched chickens as well as to study the antibiotic
pressure effect when amoxicillin was administered during their growing period. With this
aim, meconium from 22 one-day-old Ross chickens was analysed. In addition, during their
growth period, amoxicillin treatments at days 7, 21 and 35 were carried out. Results showed
a high number of E. coli-resistant strains were isolated from the treated one-day-old chickens,
and were the highest for β-lactams group, followed by quinolone and tetracyclines. After
treatment with amoxicillin, the highest percentage of resistances were detected for this
antibiotic compared to the others analysed, with significant differences in resistance
percentages between control and treated broilers detected in relation to ampicillin,
cephalothin, streptomycin, kanamycin, gentamicin, chloramphenicol and tetracycline.
Differences in resistances to ciprofloxacin and nalidixic acid between control and treated
animals were not observed and there was lack of resistance for amikacin and ceftriaxone.
These results suggest the possibility of vertical transmission of resistant strains to newlyhatched
chicks from parent flocks, and seem to indicate that the treatment with amoxicillin
increased the resistance of E. coli to other antibiotics. |
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