Rapid Increase of the Methicillin-resistant Staphylococcus intermedius Group and Methicillin-resistant Coagulase negative Staphylococci, and their Antimicrobial Drug Susceptibility

Abstract

From January 2002 to June 2009, cases of methicillin-resistant staphylococcui (MRS) have increased rapidly among small animals visiting our hospital with bacterial infection. During this period, there were 41 cases of the Staphylococcus intermedius group (SIG) resistant to methicillin (MRSIG), 15 cases of methicillin-resistant coagulase negative staphylococci (MRCoNS), and 1 case of methicillin-resistant Staphylococcus aureus. Although all MRS isolates detected in our hospital were resistant to amoxicillin-clavulanic acid, cephalexin, and cerdinir, 98% and 51% of MRSIG cases were sensitive to doxycycline (DOXY) and chloramphenicol (CP), respectively, and 87%, 53%, and 47% of MRCoNS were sensitive to DOXY, CP, and gentamicin, respectively. After administration of suitable antibiotics, 93% of all cases improved.