Survey of methicillin resistant
Staphylococcus aureus (MRSA) strains indicated that the isolation frequency of MRSA strains had rapidly increased during last few years at the department of dermatology of Gifu University Hospital. In 1990, 37% of
S. aureus strains isolated from outpatients and 78% of
S. aureus strains from inpatients were methicillin resistant, although in 1989, the isolation ratio from outpatients and from inpatients was 24%, and 63%, respectively. To carry out an epidemiological study at our dermatology department, we attempted to isolate the MRSA strains from our ward (15 different floors, five attendant furnishings) and medical staff (11 doctors, 13 nurses, and one nurse assistant). Only one strain of MRSA was isolated from the floor of the visitor’s room, and three strains were isolated from the noses of three medical staff members (one, from a doctor and two, from nurses). The bacteriological characterization of these isolates revealed that the strain from the doctor produced enterotoxin C, toxic shock syndrome toxin-1, and coagulase type III. The two strains from nurses also produced enterotoxin C and toxic shock syndrome toxin-1, but also produced coagulase type II. The MRSA strains from inpatients had similar bacteriologic traits to those are strains from the nurses and from our dermatology ward. The antibiotic resistant profiles of the strains from inpatients were also similar to those of both the environmental and nurses’ strains. Trials to eliminate MRSA strains from the noses of medical staff members by 10% popidoneiodine treatment often turned out to be unsuccessful. Recent MRSA strains from our inpatients often demonstrated multiple drug resistance and vancomycin was the only effective drug of choice for treatment. The appearance of these multiple drug resistant MRSA strains therefore poses a new serious problem at our department.
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