Sooo...how does one tell the difference between a fully vaccinated person and a not vaccinated person?
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A lot of old respiratory viruses, including ubiquitous things like RSV and even rhinoviruses, are dangerous to immuno-compromised people. But your deep reliance upon masks began only in the past year. Why?
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first, there is cross-reactive immunity from other coronaviruses already present in the population. no virus is totally novel. second, you’re talking about masking to protect the immuno-compromised, people whose immunity to all viral infections, novel or not, is vastly reduced
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