Surgical face masks and downward dispersal of bacteria

@article{Mclure1998SurgicalFM,
  title={Surgical face masks and downward dispersal of bacteria},
  author={H. A. Mclure and C. A. Talboys and Steve M. Yentis and B S Azadian},
  journal={Anaesthesia},
  year={1998},
  volume={53}
}
The ability of face masks to prevent forward dispersal of bacteria is offset by the possibility that they may increase vertical shedding of bacteria from the face during facial movement. To investigate this, a blood agar plate was placed 30 cm directly below the lips of 20 volunteers who were encouraged to talk for 20 min while moving their heads from side to side, without a face mask for the first 5 min and then with a standard, soft pleated face mask for the subsequent 15 min. The agar plates… 
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Abstract No masks were worn in one operating theatre for 6 months. There was no increase in the incidence of wound infection.
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