May of 2020 the CDC published in their EID Journal Volume 26 a study it had conducted for 78 years concerning face masks.
There were 3 influenza pandemics in the 20th century, and there has been 1 so far in the 21st century. Local, national, and international health authorities regularly update their plans for mitigating the next influenza pandemic in light of the latest available evidence on the effectiveness of various control measures in reducing transmission. Here, we review the evidence base on the effectiveness of nonpharmaceutical personal protective measures and environmental hygiene measures in nonhealthcare settings and discuss their potential inclusion in pandemic plans. Although mechanistic studies support the potential effect of hand hygiene or face masks, evidence from 14 randomized controlled trials of these measures did not support a substantial effect on transmission of laboratory-confirmed influenza. We similarly found limited evidence on the effectiveness of improved hygiene and environmental cleaning. We identified several major knowledge gaps requiring further research, most fundamentally an improved characterization of the modes of person-to-person transmission.
Every nation around the world followed the CDC guidelines for masking the population with little to no regards to the information the CDC had posted in their journal. The CDC guidelines were the major influence on reopening schools and masking our children.
School boards across the nation followed the CDC guidelines for mask mandates and the proper use of masking and wearing a mask. The CDC knew that masking a person did not work yet they recommended this for the population.
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