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We developed an ecological study of SYF through autochthonous human cases and epizootics of non-human primates (NHPs) that were spatiotemporally evaluated. We used kriging to obtain maps with isochrones representative of the evolution of the outbreak and characterized its diffusion pattern. We confirmed 648 human cases of SYF in SP, with 230 deaths and 843 NHP epizootics. Two outbreak waves were identified: one from West to East (2016 and 2017), and another from the Campinas region to the municipalities bordering Rio de Janeiro, Minas Gerais, and Paran\u00e1 and those of the SP coast (2017\u20132019). The SYF outbreak diffusion process was by contagion. The disease did not exhibit jumps between municipalities, indicating that the mosquitoes and NHPs were responsible for transmitting the virus. There were not enough vaccines to meet the population at risk; hence, health authorities used information about the epizootic occurrence in NHPs in forest fragments to identify priority populations for vaccination.<\/jats:p>","DOI":"10.1038\/s41598-021-95539-w","type":"journal-article","created":{"date-parts":[[2021,8,11]],"date-time":"2021-08-11T10:09:03Z","timestamp":1628676543000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Diffusion of sylvatic yellow fever in the state of S\u00e3o Paulo, Brazil"],"prefix":"10.1038","volume":"11","author":[{"given":"Alec Brian","family":"Lacerda","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leila","family":"del Castillo Saad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Priscilla Ven\u00e2ncio","family":"Ikefuti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adriano","family":"Pinter","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco","family":"Chiaravalloti-Neto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,8,11]]},"reference":[{"key":"95539_CR1","doi-asserted-by":"publisher","first-page":"617","DOI":"10.5123\/S1679-49742017000300018","volume":"26","author":"KRLJ Cavalcante","year":"2017","unstructured":"Cavalcante, K. 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