Oh my god those articles are stupid.

"Oxitec’s GM mosquitoes have a genetic ‘kill switch’ but no one is sure if it will work on just the GM variety or also on the bugs that interbreed with the GM ‘test’ insects. "

If only there was some way to physically scream "THAT'S THE FUCKING POINT!" at the author. The whole point is to spread the "kill switch" to the wild mosquitoes.To kill them.

The Daily mail article appears to be referring to this:

http://www.theecologist.org/News/news_analysis/2987024/pandoras_box_how_gm_mosquitos_could_have_caused_brazils_microcephaly_diasaster.html

where people started pointing to GM mosquitos having been released in areas where zika has been spreading.

never mind that areas where mosquito's are the biggest problem are the areas where you try mosquito control, in a similar vein it's suspicious that most malaria deaths are in areas where bednets have previously been distributed. There can be only one conclusion: bednets cause malaria.