There is no conclusive evidence. IE it has neither been proved in a lab nor observed in the population. Also, there is no known mechanism by which they could ca

There is no conclusive evidence. IE it has neither been proved in a lab nor observed in the population. Also, there is no known mechanism by which they could cause harm. I don’t know why the burden of proof is so difficult for people to understand. If you make a claim, the onus is on you to prove it, not for others to disprove it.