claim: combined impacts of ventilation and mask effective filtration efficiency.
evidence_1: finally, the results demonstrate that the reductions provided by ventilation and masks are synergistic and multiplicative.", "the use of moderate to high effective filtration efficiency masks by all individuals present, on the other hand, was able to significantly reduce infection probability and could achieve reductions in infection probability by 5x, 10x, or even > 100x dependent on the mask used and use of a mask fitter.", "the results reinforce the use of properly donned masks to achieve reduced aerosol transmission of sars-cov-2 and other infectious diseases transmitted via respiratory aerosol indoors and provide new motivation to further improve the effective filtration efficiency of common face coverings through improved design, and/or the use of mask fitters.", 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  "in this paper, we evaluate the efficacy of ventilation, mask effective filtration efficiency, and the combined effect of the two on the reduction of aerosol infection probability for covid-19 in a classroom setting.", "however, effective filtration efficiencies approaching the mask material filtration efficiency were achievable using simple mask fitters.")