Nationwide Surveillance of MRSA in Japan

We recruited participating medical institutions through a mailing list for the Japanese Association for Infectious Diseases in December 2018, and 51 Japanese hospitals participated in this surveillance. MRSA strains, which were detected in 2 or more sets of blood cultures at the same time, were collected at each hospital between January 22, 2019, and September 30, 2019. No MRSA strain meets the criteria in 6 hospitals. Eventually, 274 strains collected from 44 hospitals were analyzed at Nagasaki University Hospital. Four strains were excluded from the final analysis because they were identified as methicillin-sensitive Staphylococcus aureus at Nagasaki University Hospital. Finally, 270 strains collected from 44 hospitals were analyzed in this study.