The GMO mosquitoes Brazil released right in the middle of the microcephaly zone (so there is an obvious link there) were all male mosquitoes that were "supposed to" produce a single generation of GMO offspring that had a biological kill switch that rendered them sterile, so they could not reproduce. However, as it turns out, the kill switch was specifically designed to be turned off if the mosquitoes, while in the larval stage were exposed to tetracycline, an antibiotic which is derived from the biological by products of very common soil bacteria that are so prevalent in soil that they are what makes dirt smell like dirt. The kill switch was designed to fail, you can't tell me biological experts were so stupid they did not know this would happen.
Antibiotics work by interfering with the DNA of bacteria when they divide to make new bacteria. Antibiotics will also affect people to some degree, by interfering with cellular mitosis but the impact is not too much for people. So it makes perfect sense that a substance that interacts with DNA could turn a "kill switch" off.
The GMO mosquitoes survived in the wild. Some journalists are saying it is because tetracycline breaks down slowly in the wild, and it is so widely used in Brazil that it is everywhere in the environment now and an accident happened as a result all the while the probable real culprit was soil based bacteria that produce it all the time that any biologist would have known about. It would obviously be in all the puddles the mosquitoes lay their eggs in, puddles that sit right on the ground the bacteria that produce the genetic kill switch substance live in. The survival of the mosquito was intentional, NO IFS OR BUTS.
It is flatly impossible (as far as I see it) for the survival of the GMO mosquitoes to not have been planned. All that happened was someone said "Our mosquitoes have a biological kill switch, so they are safe to release", then proved it in lab conditions specifically set up to prove a point, a bureaucrat rubber stamped it, and then an intentional release of a permanently surviving and probably seriously damaging mosquito was done. What's worse? It is now proven that Zika is not causing microcephaly in Brazil, but it is happening where these mosquitoes were released. IF it is not the Tdap shot and it is instead these GMO mosquitoes carrying something other than Zika, I hate to say it - eventually the whole world will be screwed.
There is no way any biologist could have possibly overlooked the fact that the kill switch would not stand any chance of working in the wild, where the substance that deactivated it was prevalent everywhere naturally. Why did they allow a deactivation mechanism in the first place? The excuse in the lab was that it was used to make it possible for the mosquitoes to reproduce before they were released. But the choice of substances was, as far as I see it, an intentional act that would easily fool a common core educated bureaucrat, who would not realize (even if papered as a biologist with a stack 3 feet high) that the type of antibiotic used to make it possible for the mosquitoes to reproduce in the lab was everywhere naturally in the wild.