Surveillance shows Zika virus likely circulated in Rio de Janeiro, suggesting origins in Brazil.
During 2014-2016, we conducted mosquito-based Zika virus surveillance in Rio de Janeiro, Brazil. Results suggest that Zika virus was probably introduced into the area during May-November 2013 via multiple in-country sources. Furthermore, our results strengthen the hypothesis that Zika virus in the Americas originated in Brazil during October 2012-May 2013.
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Ayllón et al. (2017) studied this question.
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