In June 2021, a group of parents in Gainesville, Florida, sent 6 of their childrens’ worn face masks and face coverings to a laboratory at the University of Florida, requesting an analysis of contaminants.  The face masks and face coverings had been worn by their children for a day at school and were either brand new, or freshly laundered for the beginning of the school day.

The resulting report found that five of the face coverings were contaminated with bacteria, parasites, and fungi, including three with dangerous pathogens.

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The detailed laboratory reports can be found here

Disclaimer: Testing was conducted at the request of the parents. There is no doubt that there is harm and more research needs to be done in a controlled scientific study.