that article was based on selected circumstances:
Where wearing a mask makes a difference is when you walk into a busy supermarket where statistically covid virus is bound to be present in the air. You stay for 10-15 minutes, long enough to catch the virus and short enough not to keep wiping your glasses.The Cochrane review12 searched through six established databases (Appendix 1) looking for randomised control trials and quasi-randomised control trials investigating surgical outcomes comparing the use of disposable surgical masks with the use of no masks. The authors limited the scope of their analysis only to patients undergoing clean procedures (whereby the operating procedure does not enter a body cavity or viscus normally colonised by bacteria). The review chose not to investigate the role of mask in clean-contaminated, contaminated or dirty wounds as one would expect that masks would contribute less towards the prevention of surgical site infections under such circumstances. Primary outcomes of postoperative surgical wound infection and secondary outcomes of costs, length of hospital stay and mortality rates were ascertained.