Surveillance of Flea-Borne Typhus in California, 2011–2019

Yomogida K, Kjemtrup A, et al. Am. J. Trop. Med. Hyg., 110(1), 2024, pp. 142–149.

doi:10.4269/ajtmh.23-0272.

Abstract. Flea-borne typhus (FBT) is an acute febrile disease in humans caused by the bacteria Rickettsia typhi. In California, healthcare providers and testing laboratories are mandated to report to their respective local public health jurisdictions whenever R. typhi or antibodies reactive to R. typhi are detected in a patient. This study characterized the epidemiology of 881 flea-borne typhus cases in California from 2011 to 2019, with most cases reported among residents of Los Angeles and Orange Counties (97%). Demographics, animal exposures, and clinical courses for case patients were summarized. Additionally, spatiotemporal cluster analyses pointed to five areas in southern California with persistent FBT transmission.

Note: Additional detailed information has been published in the Proceedings of the MVCAC Annual Conference.