The common cold is an umbrella term for upper respiratory symptoms caused by a bunch of different viruses (usually rhinoviruses, non-SARS coronaviruses and RSV). Colds are usually mild, but depending on the virus and the person, they can be more severe. RSV is a more severe cold and it can kill high risk people like little kids and old people.
The reason we can’t “cure” the common cold is because there are so many different cold viruses. It would be impossible to get everyone vaccinated for every single cold virus, and it would be pretty pointless because most colds aren’t really dangerous.
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