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This study consisted of a serosurvey for Rickettsia spp. in 270 horses from 11 farms in the coastal region of Pernambuco, Brazil. Through the indirect immunofluorescence assay (IFA) based on antigens of five Rickettsia species, 164 (60.7%) horses were seroreactive to Rickettsia spp., with seroreactivity among farms ranging from 10 to 100%. Through molecular analysis, all 270 horse blood DNA samples tested negative by PCR assays targeting Anaplasmataceae family or genus Borrelia agents. A total of 1,852 ticks was collected from horses and identified as 1,850 Dermacentor nitens Neuman, 1897, and two Rhipicephalus microplus (Canestrini, 1888). No rickettsial DNA was amplified from horse ticks. Additionally, 48 tick specimens were collected from 14 wild vertebrates from the same study region, and identified into six species: Amblyomma fuscum Neumann, 1907, Amblyomma longirostre (Koch, 1844), Amblyomma nodosum Neumann, 1899, Amblyomma rotundatum Koch, 1844, Amblyomma varium Koch, 1844, and Ornithodoros mimon Kohls, Clifford &amp; Jones, 1969. Twenty-five of these ticks were processed by molecular analysis, which resulted in no amplification of DNA from Anaplasmataceae, Piroplasmida, Borrelia, or Coxiella. However, three adults of A. nodosum contained DNA of Rickettsia parkeri Lackman et al., 1965 strain NOD, and two larvae of A. longirostre contained DNA of Rickettsia amblyommatis Karpathy et al. (2016). This study provides serological evidence of exposure to spotted fever group (SFG) rickettsiae in horses and reports two SFG agents infecting ticks from wildlife in Northeastern Brazil.<\/jats:p>","DOI":"10.1093\/jme\/tjaf155","type":"journal-article","created":{"date-parts":[[2025,10,24]],"date-time":"2025-10-24T11:12:51Z","timestamp":1761304371000},"source":"Crossref","is-referenced-by-count":2,"title":["Serological evidence of\n                    <i>Rickettsia<\/i>\n                    in horses and survey of tick-borne agents in ticks from horses and wildlife in the state of Pernambuco, Brazil"],"prefix":"10.1093","volume":"63","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2844-5509","authenticated-orcid":false,"given":"Rinaldo Aparecido","family":"Mota","sequence":"first","affiliation":[{"name":"Department of Veterinary Medicine, University Federal Rural of Pernambuco (UFRPE) , Recife,","place":["Brazil"]},{"name":"Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine and Animal Science, University of S\u00e3o Paulo , S\u00e3o Paulo,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0627-4398","authenticated-orcid":false,"given":"Igor Silva","family":"Silito","sequence":"additional","affiliation":[{"name":"Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine and Animal Science, University of S\u00e3o Paulo , S\u00e3o Paulo,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5117-2959","authenticated-orcid":false,"given":"Matheus Pasini","family":"Martins","sequence":"additional","affiliation":[{"name":"Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine and Animal Science, University of S\u00e3o Paulo , S\u00e3o Paulo,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3133-1799","authenticated-orcid":false,"given":"Pollyanne Raysa Fernandes de","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, University Federal Rural of Pernambuco (UFRPE) , Recife,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7162-2745","authenticated-orcid":false,"given":"Renata Pimentel Bandeira de","family":"Melo","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, University Federal Rural of Pernambuco (UFRPE) , Recife,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3963-4719","authenticated-orcid":false,"given":"Valdir","family":"Vieira da Silva","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, University Federal Rural of Pernambuco (UFRPE) , Recife,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3700-3574","authenticated-orcid":false,"given":"Felipe Rodrigues","family":"Jorge","sequence":"additional","affiliation":[{"name":"Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine and Animal Science, University of S\u00e3o Paulo , S\u00e3o Paulo,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7325-3362","authenticated-orcid":false,"given":"Thiago Fernandes","family":"Martins","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, University Federal Rural of Pernambuco (UFRPE) , Recife,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9675-3132","authenticated-orcid":false,"given":"Marcelo Bahia","family":"Labruna","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, University Federal Rural of Pernambuco (UFRPE) , Recife,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2025,10,24]]},"reference":[{"key":"2026031200573195300_tjaf155-B1","doi-asserted-by":"publisher","first-page":"203","DOI":"10.1016\/j.ttbdis.2012.02.003","article-title":"Coxiella symbiont in the tick Ornithodoros rostratus (Acari: Argasidae)","volume":"3","author":"Almeida","year":"2012","journal-title":"Ticks Tick. 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