(Cuban here.) I find this result very interesting, really, as we're exposed to these chemicals in varying degrees and frequency. I personally live in a epidemiological controlled/safe (-ish) area of Havana, so my exposure is very limited. However, I do know that some other areas are way more affected by vectors since they are less urbanized and with more population density.

In those cases the authorities are more aggressive in the use of mass fumigation, particularly during the summer and autumn; but still I don't think that such elevated frequency produces the effects shown in the article, for the general population, that is.

It is true that we're particularly vulnerable to zika, chikungunya, yellow fever, and dengue fever (especially in 2016); and what I can easily imagine (and conjecture) is that diplomatic personnel were overly (and rightly) concerned, and liberally applied these products with more zeal than necessary. Thus, increased their exposition to these chemicals.