Many consumer and industrial products contain perfluorinated compounds (PFCs), which are highly-persistent organofluorine compounds that make certain materials oil, water, and stain resistant. But according to a new study published in the Journal of the American Medical Association, PFCs in non-stick cookware, clothing, furniture, and food packaging appear to be responsible for causing vaccines to fail as well, as they can reduce antibody concentrations to levels below what is considered effective for warding off disease.