Of course a good respirator should be used, if available, when in close contact with a symptomatic patient. No assumptions about “can’t infect because...” are valid when in extremely close proximity (say 2 meters).
But Ebola doesn’t spread in the way a classic aerosolized virus does, across several aisles of a supermarket, for example, or through the entire cabin air of an airliner. If that were the case then million of Africans would already be dead of Ebola.
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