By the second Omicron wave, wearing masks was shown to offer no protection for adults and potentially increased the risk of infection in children…

Ms. Brainard told The Epoch Times that she and her co-author, Dr. Paul Hunter, felt that some people invested “way too much faith” in wearing masks. Their 2020 systematic review suggested that masks only modestly reduced the risk of transmission of influenza-like illnesses by about 19 percent if both parties—the infected and susceptible—wore masks.

https://www.zerohedge.com/medical/masks-found-be-ineffective-after-first-omicron-wave-new-study

AND

Changing risk factors for developing SARS-CoV-2 infection from Delta to Omicron

https://journals.plos.org/plosone/article?