This claim is false. According to multiple government websites, masks, depending on which type is used, will “effectively block the respiratory cloud.” While the article states that “side leakage is possible,” it’s ultimately more effective in blocking disease versus not wearing anything at all. The National Institutes of Health ran an experiment where they used a test-negative case-control design where researchers took California residents who’d tested positive or negative for SARS-CoV-2. Participants self-reported their mask usage in indoor public settings during the two weeks before testing and had no known exposure to infected individuals. The results found that “always using a face mask or respirator in indoor public settings was associated with lower adjusted odds of a positive test result compared with never wearing a face mask or respirator.” Both the quote and experiment were from different government websites, vadiling the credibility.
Citations:
Andrejko, K. L., Pry, J. M., Myers, J. F., Fukui, N., DeGuzman, J. L., Openshaw, J., Watt, J. P., Lewnard, J. A., Jain, S., & California COVID-19 Case-Control Study Team. (2022, February 11). Effectiveness of face mask or respirator use in indoor public settings for prevention of SARS-COV-2 infection - California, February-December 2021. MMWR. Morbidity and mortality weekly report. https://pmc.ncbi.nlm.nih.gov/articles/PMC8830622/#sec1
Wang, Y., Deng, Z., & Shi, D. (2021, February). How effective is a mask in preventing COVID-19 infection?. Medical devices & sensors. https://pmc.ncbi.nlm.nih.gov/articles/PMC7883189/