The ‘common cold’ is the name for an upper respiratory tract infection that is caused by numerous different viruses only some of which come from the Coronavirus family. It's a group of illnesses sharing similar symptoms and it's the fact that It is caused by numerous different microorganisms that makes the development of a vaccine impossible. Instead, we are protected to a degree by herd immunity. Covid 19 is caused by a single virus - SARS-CoV-2.



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