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abstractpubmed· Abstract 2017· item PMID:28953451

Detection of Zika Virus in April 2013 Patient Samples, Rio de Janeiro, Brazil. We tested 210 dengue virus‒negative samples collected from febrile patients during a dengue virus type 4 outbreak in Rio de Janeiro in April 2013 and found 3 samples positive for Zika virus. Our findings support previously published entomological data suggesting Zika virus was introduced into Brazil during October 2012-May 2013.