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Is it reasonable that 10% of any population is suffering from a cold on any given two-week period? If "symptoms of respiratory infection" include allergies, then yes. Incidentally, face masks work great for reducing exposure to pollen, too.

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thanks, good point. But don't many pollen allergies come via the eyes? At least, that's the idea behind Stoggles: https://stoggles.com/blogs/the-public-eye/allergy-eye-protection-glasses

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Face masks won't help with red, itchy eyes, but do help with runny noses and sneezing.

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