More from the annals of shit you'll reject because your opinions are better than rigorously-tested, unbiased, scientific data... aka you're mentally retarded. BTW, this was done prior to any political influence over COVID-19.
It's common sense, retards, that putting on a filter filters shit:
Rates of all outcomes were consistently lower in the continuous N95 and/or targeted N95 arms. In adjusted analysis, rates of laboratory-confirmed bacterial colonisation (RR 0.33, 95% CI 0.21-0.51), laboratory-confirmed viral infections (RR 0.46, 95% CI 0.23-0.91) and droplet-transmitted infections (RR 0.26, 95% CI 0.16-0.42) were significantly lower in the continuous N95 arm. Laboratory-confirmed influenza was also lowest in the continuous N95 arm (RR 0.34, 95% CI 0.10-1.11), but the difference was not statistically significant. Rates of laboratory-confirmed bacterial colonisation (RR 0.54, 95% CI 0.33-0.87) and droplet-transmitted infections (RR 0.43, 95% CI 0.25-0.72) were also lower in the targeted N95 arm, but not in medical mask arm.
When only the continuous N95 arm was compared against control, the risk of laboratory-confirmed influenza was significantly lower in continuous N95 arm (RR 0.23 and 95% CI 0.06-0.93, or 77% efficacy).