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To be fair, it's not necessarily the case that an unvaccinated population is the best case for masks. If vaccination reduces infectiousness, adding a mask on to
by FeepingCreature 5y ago
To be fair, it's not necessarily the case that an unvaccinated population is the best case for masks. If vaccination reduces infectiousness, adding a mask on top could push a small exposure down to a noninfection, whereas a one-time large exposure would overwhelm it.