2018 Volume 67 Issue 5 Pages 747-754
The Okayama Microbial Club (CLUB Saikin), which was organized by 17 medical institutions in Okayama in 2008, conducted a survey on the prevalence of methicillin-resistant Staphylococcus aureus (MRSA), multiple-drug-resistant Pseudomonas aeruginosa (MDRP), and extended spectrum β-lactamase (ESBL)-producing bacteria in facilities that participate in the club from 2011 to 2015. The frequencies of MRSA and MDRP isolation from hospitalized patients decreased from 10.99% to 8.34% and 0.55% to 0.24%, respectively. Despite the downward trend for both bacteria over the 5 years, these frequencies still exceed the national average reported by the Japan Nosocomial Infection Surveillance (JANIS) in 2015, with 6.64% for MRSA and 0.07% for MDRP. In outpatient settings, the prevalence of MRSA increased from 26.25% to 28.69% during the study period, suggesting the spread of MRSA outside of the hospital. The isolation frequencies of ESBL-producing E. coli and K. pneumoniae showed an increasing trend in both inpatient and outpatient settings, suggesting an increase in the number of ESBL-producing-bacteria carriers owing to various risk factors. It is important to continue the survey to strengthen information sharing, cooperation in the community, and for the effective infection control in hospitals with updated information.
