One health approach to Rickettsia spp.: Brazilian indigenous individuals, their dogs and ticks, and healthcare professionals

Although Indigenous populations have historically overlapped the occurrence of vector-borne pathogens, no One Health approach study has investigated <i>Rickettsia</i> spp. in indigenous communities worldwide. Accordingly, the aim of this study was to investigate anti-<i>Rickettsia</i> spp. antibodies in indigenous individuals, their dogs and healthcare professionals, and <i>Rickettsia</i> spp. infection in ticks from ten indigenous communities of southern and southeastern Brazil. In overall, 66/771 (8.6 %) indigenous individuals, 9/99 (9.1 %) healthcare professionals and 116/386 (30.1 %) dogs were seropositive for at least one out four <i>Rickettsia</i> species tested by immunofluorescence assay (IFA). Out of 603 ticks collected from dogs in indigenous communities, 9/190 (4.7 %) tested positive to fragment of <i>Rickettsia gltA</i> gene by real-time PCR. The homologous antigenic reactions in dogs were significantly more frequent for <i>R. bellii</i> when compared to <i>R. parkeri</i> and <i>R. amblyommatis</i> and may be associated with the high diversity of hard and soft ticks in Americas, and <i>R. bellii</i> capacity of inhibiting another pathogenic rickettsia. Tick bite history increased the seropositivity (odds ratio = 9.29; <i>p</i> = 0.019) in healthcare professionals. This difference may be consequence of higher capacity to recognize tick bites by healthcare professionals, which highlighted the necessity of health care education for indigenous individuals for prevention and early recognition of tick-borne diseases in indigenous communities. In addition, the One Health approach herein has provided a holistic understanding of <i>Rickettsia</i> spp. infection in such communities and correspondent healthcare personal.