Here is an interesting article about a CDC study you will probably not read or hear about in the msm.
From SHTFplan.com:
The study, which was conducted in the United States in July found that when the CDC compared 154 “case-patients,” who tested positive for COVID-19, to a control group of 160 participants from the same health care facility who were symptomatic but tested negative, over 70 percent of the case-patients were contaminated with the virus and fell ill despite “always” wearing a mask.
In the 14 days before illness onset, 71% of case-patients and 74% of control participants reported always using cloth face coverings or other mask types when in public,” the report stated.