Posted on May 2, 2016 by Hank Campbell
Steven Hicks, M.D. PhD, pediatrician at Penn State Milton S. Hershey Medical Center in Hershey, Pennsylvania, looked at autism rates in a swampy region of New York and saw higher developmental delay and autism diagnoses in some areas and thinks he knows why; pyrethroid pesticides being sprayed by airplanes to kill mosquitoes.
Scientists, toxicologists, and public health officials certainly appreciate some attention being drawn to killing mosquitoes as the season — and Zika concern — approaches, but chemically it just can’t be true, for three reasons:
1. Pyrethroids are less toxic than the popular home-use repellent DEET. DEET is even applied directly to the skin, where it is readily absorbed into the blood. It still isn’t harmful, meaning pyrethroids are even safer.
2. There is no plausible biological mechanism for this correlation and none is proposed; it is simply two curves that happen to show an association, real or otherwise. It could just be a spurious correlation. For example, organic food sales have also increased with autism (1), which is obviously ridiculous. Furthermore, there are many reasons why people who live near swampland may seem to have more diagnosed developmental delays — a broadening of the definition of autism, and better reporting in areas that were not as well serviced before.
3. Pyrethroids have been used for 50 years, so they can’t suddenly be causing autism. In the zip codes that were analyzed, 1 in 120 children was diagnosed with autism spectrum disorder or a developmental delay, while the same class of pesticides without aerial spraying was 1 in 172. Yet the prevalence nationwide for autism spectrum disorder is 1 in 68. From these data, it could be argued that pyrethroids lower the chances of autism, which is no more or less valid than these claims.....To Read More....
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