Covid: chemicals found in everyday products could hinder vaccine

"People with high exposure to PFAS have a non-protective and very low antibody levels after four vaccinations for diphtheria and tetanus," Grandjean said. "So if a vaccine for Covid is similar, the PFAS will likely inhibit the response from a vaccine. But it is an unknown at this stage."

https://www.theguardian.com/world/2020/nov/17/chemicals-found-in-everyday-products-could-hinder-covid-19-vaccine