A study published in The Lancet found a strong connection between Zika and microcephaly in fetuses in French Polynesia
http://www.thelancet.com/journals/lancet/article/PIIS0140-67...
http://www.thelancet.com/journals/lancet/article/PIIS0140-67...
From the article: The original study on which the oil theory is founded, by Dr Juan Tabuenca Oliver, was published in the Lancet
Also from the article: they concluded that, without any doubt, the contaminated foodstuff was tomatoes, and it was the pesticides on them that were responsible for the epidemic. The organo-phosphorous chemicals would indeed cause the range of symptoms observed by clinicians.
Getting published in The Lancet does not prove anything. eg MMR vacine\autism.
The article is well worth a read.