The effect of ampicillin and tylosin on the faecal enterococci of healthy young chickens |
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| Authors: | Anne Kaukas M Hinton A H Linton |
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| Institution: | Department of Veterinary Medicine, University of Bristol, Langford House, Langford, Avon BS18 7DU;*Department of Microbiology, University of Bristol Medical School, University Walk, Bristol BS8 1TD, UK |
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| Abstract: | Enterococcal isolates from young chickens were differentiated into one of three species, namely Enterococcus faecalis, Ent. faecium and Ent. gallinarum . The proportion of each species among the enterococcal population changed with time in birds not dosed with antibiotics. This pattern of change was modified in birds dosed with either tylosin or ampicillin even though ampicillin did not select for ampicillin resistance among the enterococcal population. A gradual increase in tylosin resistance was recorded with time among the enterococci of the 'undosed' control birds. This was associated with an increase in the proportion of Ent. faecium , a species commonly resistant to tylosin, among the enterococci of the birds as they grew older. |
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