{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T11:37:08Z","timestamp":1792496228332,"version":"4.5.0"},"reference-count":56,"publisher":"American Society for Microbiology","issue":"6","license":[{"start":{"date-parts":[[2017,11,14]],"date-time":"2017-11-14T00:00:00Z","timestamp":1510617600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2017,12,29]],"date-time":"2017-12-29T00:00:00Z","timestamp":1514505600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"funder":[{"DOI":"10.13039\/100009139","name":"Deutsches Zentrum f\u00fcr Infektionsforschung","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100009139","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010661","name":"EC | Horizon 2020 Framework Programme","doi-asserted-by":"publisher","award":["734548"],"award-info":[{"award-number":["734548"]}],"id":[{"id":"10.13039\/100010661","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["mBio"],"published-print":{"date-parts":[[2017,12,29]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>During 2015 to 2016, Brazil reported more Zika virus (ZIKV) cases than any other country, yet population exposure remains unknown. Serological studies of ZIKV are hampered by cross-reactive immune responses against heterologous viruses. We conducted serosurveys for ZIKV, dengue virus (DENV), and Chikungunya virus (CHIKV) in 633 individuals prospectively sampled during 2015 to 2016, including microcephaly and non-microcephaly pregnancies, HIV-infected patients, tuberculosis patients, and university staff in Salvador in northeastern Brazil using enzyme-linked immunosorbent assays (ELISAs) and plaque reduction neutralization tests. Sera sampled retrospectively during 2013 to 2015 from 277 HIV-infected patients were used to assess the spread of ZIKV over time. Individuals were georeferenced, and sociodemographic indicators were compared between ZIKV-positive and -negative areas and areas with and without microcephaly cases. Epidemiological key parameters were modeled in a Bayesian framework. ZIKV seroprevalence increased rapidly during 2015 to 2016, reaching 63.3% by 2016 (95% confidence interval [CI], 59.4 to 66.8%), comparable to the seroprevalence of DENV (75.7%; CI, 69.4 to 81.1%) and higher than that of CHIKV (7.4%; CI, 5.6 to 9.8%). Of 19 microcephaly pregnancies, 94.7% showed ZIKV IgG antibodies, compared to 69.3% of 257 non-microcephaly pregnancies (<jats:italic>P<\/jats:italic>= 0.017). Analyses of sociodemographic data revealed a higher ZIKV burden in low socioeconomic status (SES) areas. High seroprevalence, combined with case data dynamics allowed estimates of the basic reproduction number<jats:italic>R<\/jats:italic><jats:sub>0<\/jats:sub>of 2.1 (CI, 1.8 to 2.5) at the onset of the outbreak and an effective reproductive number<jats:italic>R<\/jats:italic><jats:sub>eff<\/jats:sub>of &lt;1 in subsequent years. Our data corroborate ZIKV-associated congenital disease and an association of low SES and ZIKV infection and suggest that population immunity caused cessation of the outbreak. Similar studies from other areas will be required to determine the fate of the American ZIKV outbreak.<\/jats:p><jats:p><jats:bold>IMPORTANCE<\/jats:bold>The ongoing American Zika virus (ZIKV) outbreak involves millions of cases and has a major impact on maternal and child health. Knowledge of infection rates is crucial to project future epidemic patterns and determine the absolute risk of microcephaly upon maternal ZIKV infection during pregnancy. For unknown reasons, the vast majority of ZIKV-associated microcephaly cases are concentrated in northeastern Brazil. We analyzed different subpopulations from Salvador, a Brazilian metropolis representing one of the most affected areas during the American ZIKV outbreak. We demonstrate rapid spread of ZIKV in Salvador, Brazil, and infection rates exceeding 60%. We provide evidence for the link between ZIKV and microcephaly, report that ZIKV predominantly affects geographic areas with low socioeconomic status, and show that population immunity likely caused cessation of the outbreak. Our results enable stakeholders to identify target populations for vaccination and for trials on vaccine efficacy and allow refocusing of research efforts and intervention strategies.<\/jats:p>","DOI":"10.1128\/mbio.01390-17","type":"journal-article","created":{"date-parts":[[2017,11,15]],"date-time":"2017-11-15T01:10:24Z","timestamp":1510708224000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":181,"title":["High Zika Virus Seroprevalence in Salvador, Northeastern Brazil Limits the Potential for Further Outbreaks"],"prefix":"10.1128","volume":"8","author":[{"given":"Eduardo Martins","family":"Netto","sequence":"first","affiliation":[{"name":"Hospital Universit\u00e1rio Professor Edgard Santos, Universidade Federal de Bahia, Salvador, Brazil"},{"name":"Instituto Brasileiro para a Investiga\u00e7\u00e3o da Tuberculose\/Funda\u00e7\u00e3o Jos\u00e9 Silveira (IBIT\/FJS), Salvador, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andres","family":"Moreira-Soto","sequence":"additional","affiliation":[{"name":"Institute of Virology, University of Bonn Medical Centre, Bonn, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Celia","family":"Pedroso","sequence":"additional","affiliation":[{"name":"Hospital Universit\u00e1rio Professor Edgard Santos, Universidade Federal de Bahia, Salvador, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph","family":"H\u00f6ser","sequence":"additional","affiliation":[{"name":"Institute for Hygiene and Public Health, GeoHealth Centre, WHO Collaborating Centre for Health Promoting Water Management &amp; 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