If it does not stop it all, it is a failure.
No it is not. There are several other factors at play. The rule of the odds says that the more pathogen that is deposited into the environment, the more likely likely you are to encounter it. Then, recent research is showing that the viral load has much to do with the severity of the illness. Add a face covering to the would be recipient, and a more of the pathogen can be trapped before making it into their body.
