Right, the mask will stop spittle.    The virus is 0.1 microns, the N95 mask stops 0.3 microns. Spittle is larger than 0.3 microns and can travel 30 feet. If it gets in your eye, it infects; and it stays on surfaces up to 9 days. Anyhow it's nearly impossible to avoid - perhaps it travels through ventilation systems.