| evidence of the presence of the zika virus in mexico since early 2015. | to assess the possible circulation of zika virus (zikv) prior to the first documented case in mexico, we reanalyzed the stored samples from the states of veracruz and yucatán, which were originally collected to test for dengue (denv) and chikungunya (chikv) but were negative for these viruses despite the symptomatology. the samples were originally collected between the 30 and 46 epidemiological weeks (ew) when the zikv was not yet declared as a public health emergency of international concern (p ... | 2016 | 27557815 |