Sy Borg wrote:Ok, there's a room with 200 virions floating around. A woman is in there, and she is vulnerable. Aman walks in without a mask. He heroically breathes in one coronavirus virion, preventing her from breathing it in.
RJG wrote:Again, Sy, this is just about the simple math involved in calculating risk assessment. Nothing more than that!
1. The more people that share the same viral load within a given environment, the lower the proportional risk is to any individual within that environment.
2. An unmasked person takes on a significantly greater proportion of the total risk (greater exposure to the inhalation of viral particles) than does a masked person within the same environment.
Mathematically, she is significantly safer when he enters the room. Period. If he breathes in any viral particles, then that is just added icing on the cake.
Sy, you are completely missing the point. It doesn't matter how many virions are in, or are left in, the room.Sy Borg wrote:No, there's 199 virions left. Besides, it makes little difference to the woman whether a virion is sucked into someone else's lungs or mask.
My point is that the probability of the lady getting infected greatly decreases (20X in this case) when the unmasked immune man enters the room. The 20X safety factor does not care how many virions are in the room.