How the omicron spreads and what works
A: inhalation of a wide size range of aerosols (including small <5 micron) at close proximity
B: inhalation of small aerosols that remain suspended in room air at a distance (>2m)
C: small risk of direct exposure to large droplets at close proximity
D: small risk of exposure through face touch following contact with contaminated surfaces 2/
Emission of virus increases with coughing, sneezing and vocal activities such as singing and loud talking.
Emissions are likely to be highest just at the point where someone turns infectious.
Hand washing and cleaning only does D. Important but probably a small component of risk.
Distancing is good for C and A, but won’t take away all of the risk and doesn’t work if your role means you have to get close
Screens do C and a bit of A but only for some specific cases
Ventilation and air cleaning is good for B and a little bit of A and is especially important if you share a room with others for longer periods of time. It’s not 100% though and it may be hard to mitigate very highly infectious cases.
Masks are good for A, B, C and D. They can mitigate droplets and large aerosols, reduce surface contamination and prevent you touching your face. They can reduce emission of all aerosol sizes. But as protection, especially at close range, only FFP3 mitigates smallest aerosols
The LocalCircles mask compliance report presents the ugly reality. The Govt must circulate to all and have them enforce mask discipline. The Govt data is outdated and small sample says 60% India is mask compliant which is wrong.
Please upgrades masks and maintain physical distance. more