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The effect of ampicillin and tylosin on the faecal enterococci of healthy young chickens
Author(s) -
Kaukas Anne,
Hinton M.,
Linton A. H.
Publication year - 1987
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1987.tb02674.x
Subject(s) - tylosin , ampicillin , enterococcus faecium , biology , enterococcus faecalis , amp resistance , microbiology and biotechnology , enterococcus , antibiotics , population , veterinary medicine , antibiotic resistance , medicine , bacteria , environmental health , staphylococcus aureus , genetics
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.