A total of 221 SIG strains were isolated from clinical samples of canine origin submitted to the
Diagnostic Laboratory of the Division of Bacteriology and Molecular Biology at the Warsaw University
of Life Sciences in Warsaw during the period 2006-2010. The aim of the study was to investigate
the frequency of prevalence of methicillin-resistant SIG strains and to determine the MIC values of
cephalotin, amoxicillin/clavulanic acid, ciprofloxacin, clindamycin, gentamicin, chloramphenicol,
mupirocin for a collection of randomly selected 79 strains belonging to Staphylococcus intermedius
group (SIG), including 23 mecA-positive and 56 mecA-negative strains. All isolates were identified as
belonging to SIG based on their phenotypic properties and PCR amplification of S. intermedius-
specific fragment of the 16S rRNA gene. The mecA gene was detected in 26 (12%) of 221 SIG
strains. All tested mecA-negative SIG strains were susceptible to amoxicillin/clavulanic acid and
cephalotin. One of the 56 mecA-negative SIG strains was resistant to ciprofloxacin, six (11%) to
gentamicin. It was found that sixteen (29%) of 56 mecA-negative SIG strains were resistant to
clindamycin. Most of the mecA-positive SIG strains were resistant to ciprofloxacin (96%), clindamycin
(96%), and gentamicin (96%). Only one MRSIG strain was resistant to chloramphenicol. All
examined mecA-positive SIG strains were found to be susceptible to mupirocin. Our results imply that
staphylococcal multidrug resistance has become more prevalent, which could lead to difficulties in
effective treatment. With some resistant strains the only therapeutic possibility are antimicrobial
agents important in human medicine. New regulations for veterinary medicine concerning appropriate
therapy of infections caused by multidrug-resistat staphylococci are needed.
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