Is surgical mask useful to prevent flu?
Saw this from Japanprobe.com today. Very interesting video showing how the small particles (0.3~ 5 micron) spread when someone sneeze with or without a mask:
Is surgical mask useful to prevent flu? Read More »
Saw this from Japanprobe.com today. Very interesting video showing how the small particles (0.3~ 5 micron) spread when someone sneeze with or without a mask:
Is surgical mask useful to prevent flu? Read More »