I posted this in the earlier thread about the first linked article, but I will repeat it here.
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My vet’s office sent out a mass email, giving this article in support of the use of Seresto collars.
https://news.vin.com/default.aspx?pid=210&Id=10129480
Just my opinion, but the article seems to be a pretty wishy-washy defense of the product. The collars causing the problems might be counterfeit ... federal regulators are unable to say whether the collars are authentic ... the EPA doesn’t have any information about possible counterfeiting. It really doesn’t make me feel any more confident the collars are safe.