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Of course, an inspirator is the easiest and cheapest way to prevent virus infection, but not the most effective. We have to appeal to other measures additionally.
I suggest to create special nasal micro-filter which is nested into nostrils and make possible unstopped breath. This device also preserves man from other harmful effects. For example, from toxic gases.
I like the idea, but have to add, that these filters will have to be sold with an additional mouth-closer, because all the mucose tunic of the whole upper respiratory tract is prone to become the "entrance gate" for these viruses.