Staphylococcus delphini and Methicillin-Resistant S. pseudintermedius in Horses, Canada

ecologic interactions between genetically diverse strains (8). In this report, we describe a single case; comparison of disease severity of scrub typhus caused by mixed and single genotype infections should be studied further. Simultaneous infection with multiple antigenic strains of O. tsutsugamushi was detected in an individual mite, Leptotrombidium arenicola (9), a probable vector of scrub typhus. Infection with multiple O. tsutsugamushi strains may be caused by being bitten by multiple mites or by multiple genotypes coexisting within individual mites (7). We ascribed the co-infection to the second cause because the 2 genotypes were simultaneously detected from an eschar sample associated with the bite of 1 mite examined in this study. There may be diverse genotypic co-infection patterns of O. tsutsugamushi. Mechanisms of in-host interactions between genetically diverse strains of O. tsutsugamushi and the initiated host response require the establishment of animal models for further research.