You are very vulnerable to inhaling all sorts of germs, viruses, fungal spores etc from others in warm, enclosed spaces particularly in winter with windows shut .
Covid is essentially breathed in by those who catch it from infected people spluttering, coughing, talking, shouting, singing etc whilst in enclosed spaces.
The viruses are transmitted to others found in microscopic droplets of spray, sneezed or coughed out!👆by those infected.
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