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Journal of Clinical Microbiology, 09 1996, 2072-2077, Vol 34, No. 9
J Kawano, A Shimizu, Y Saitoh, M Yagi, T Saito and R Okamoto
Methicillin-resistant coagulase-negative staphylococci were isolated from
the nares and skin of 1- to 8-week-old healthy chickens in three flocks
from a farm. Isolation of methicillin-resistant coagulase- negative
staphylococci was positive for 72 (25.7%) of the 280 chickens tested, with
the frequency varying from 2.2 to 100% according to flock. A total of 45
appropriate isolates were selected and subjected to identification. Of the
45 methicillin-resistant coagulase-negative staphylococcal isolates
selected, 37 were identified as Staphylococcus sciuri, 5 were identified as
Staphylococcus epidermidis, and 3 were identified as Staphylococcus
saprophyticus. The distribution of the species was different among the
flocks. Comparative analysis of the SmaI-digested chromosomal DNA by
pulsed-field gel electrophoresis revealed that the isolates could have
originated from a single clone of each of S. sciuri and S. saprophyticus
and three clones of S. epidermidis. By two methods based on the PCR
technique, the mecA gene was detected in all five representative isolates
of each methicillin- resistant coagulase-negative staphylococcal clone. The
nucleotide sequence of a PCR fragment obtained from an isolate of S. sciuri
was completely identical to the corresponding region of mecA genes reported
in human methicillin-resistant Staphylococcus aureus isolates and
Staphylococcus epidermidis isolates. The representative methicillin-
resistant coagulase-negative staphylococcal isolates were resistant to many
beta-lactam antibiotics, and some isolates were also resistant to macrolide
and aminoglycoside antibiotics. This is the first evidence of the existence
of methicillin-resistant coagulase-negative staphylococci from animals
possessing the mecA gene.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Isolation of methicillin-resistant coagulase-negative staphylococci from chickens
Department of Animal Science, Faculty of Agriculture, Kobe University, Japan.
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