What is already known about this topic? Face masks or respirators (N95/KN95s) effectively filter virus-sized particles in laboratory settings. The real-world effectiveness of face coverings to prevent ...
ROCKFORD (WREX) — The type of protective face mask you wear can make a difference when you're out and about. The effectiveness of different types of masks are becoming a crucial question as COVID-19 ...
NBC News investigative and consumer correspondent Vicky Nguyen demonstrated on TODAY how effective face masks truly are: She coughed onto petri dishes wearing three different types of face masks ...
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