Kala-azar and Post–Kala-azar Dermal Leishmaniasis, Assam, India

remain unknown. S. delphini has rarely been identified in horses, but, as we observed, it may be misidentified by conventional methods. Although colonization or contamination appeared most likely in the instances we describe, these findings suggest that this opportunistic pathogen can be found in horses and might be pathogenic in certain situations. Our findings highlight the importance of using additional identification methods (e.g., MALDI-TOF, Staphylococcus species–specific PCR) for differentiation of SIG members (notably S. delphini and S. pseudintermedius) to effectively document the emergence of these species in horses. In addition, these findings indicate the need to ensure proper differentiation of S. aureus from SIG in equine isolates, despite the historical predominance of S. aureus, because of the differences in methods for determination of methicillin resistance. Future studies are needed to determine prevalence trends and disease roles for these species in equids.