Hey, Winston, Sputum (virus + fluids) would be a problem for anyone 'hit' with its droplets; the closer one is and the more confined the air volume in the room, the greater the possible exposure. Near as I have read, the more virus you inhale the greater the risk; I think that small amounts of virus can probably be handled by a healthy immune system. (This is where I get mad at the CDC/NIH and its toadies. They say that CV-19 is "novel," that we haven't seen this exact viral genome (blueprint) before. That last may be true but coronaviruses make up ~1/3 of all common cold viruses so that means (IMO) our immune systems have seen bits and pieces/strands of coronavirus all of our lives. That may be why there are so many asymptomatic cases--those people handled the virus like LSU handled Clemson)! As to the wearing of a mask, I do not do so because of 1) the general inefficiency of the 'filter' 2) dilution effect of an outdoor and large air volume restaurant/store 3) my strong belief that the way we as a country beat the virus is by allowing the natural development of herd immunity (65+% of total pop.); sure, hiding under one's bed will "stop the spread" but it also stops the transmission needed to defeat the virus via herd immunity; 4) to each his own. I'm working full time, shooting at the gun club, shopping in big box stores, etc. all w/o any masks. Finally, don't hold your breath for a vaccine. There has NEVER been an effective, persistent vaccine for ANY coronavirus type; these are not like H1N1, etc, that have distinct proteins which can be targeted by vaccines. And I won't be offering my arm for a rushed-into-production, minimally-tested, unknown-long-term-effect vaccine put out by the unholy collaboration of BigPharma and the serial liars of the CDC/NIH. Oops! Pardon my rant! "If social distancing works why do we need masks? If masks work why do we need social distancing?"