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This was made possible due to the large number of babies born with microcephaly in the Northeast region (NE) in a narrow time. We hypothesize that the fivefold difference in the rate of microcephalic neonates between the NE and other regions is partially an effect of the population prior immunity against Dengue viruses (DENV), that cross-react with ZIKV. In this ecological study, we analysed the interaction between dengue fever epidemics from 2001 to 2014 and the 2015\/2016 microcephaly epidemic in 400 microregions in Brazil using random-effects models under a Bayesian approach. The estimated effect of the time lag between the most recent large dengue epidemic (&gt;400\/100,000 inhabitants) and the microcephaly epidemic ranged from protection (up to 6 years prior) to an increased risk (from 7 to 12 years). This sustained window of protection, larger than described in previous longitudinal studies, is possibly an effect of herd immunity and of multiple exposures to DENV that could boost immunity.<\/jats:p>","DOI":"10.1038\/s41598-020-58407-7","type":"journal-article","created":{"date-parts":[[2020,2,4]],"date-time":"2020-02-04T11:02:47Z","timestamp":1580814167000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Association of past dengue fever epidemics with the risk of Zika microcephaly at the population level in Brazil"],"prefix":"10.1038","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9566-0284","authenticated-orcid":false,"given":"Marilia S\u00e1","family":"Carvalho","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9012-9382","authenticated-orcid":false,"given":"La\u00eds Picinini","family":"Freitas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Oswaldo Gon\u00e7alves","family":"Cruz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patr\u00edcia","family":"Brasil","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1406-0122","authenticated-orcid":false,"given":"Leonardo Soares","family":"Bastos","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,2,4]]},"reference":[{"key":"58407_CR1","doi-asserted-by":"publisher","first-page":"96","DOI":"10.3390\/ijerph15010096","volume":"15","author":"R Lowe","year":"2018","unstructured":"Lowe, R. et al. 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