3 stains

Sorry strains. A, B and C. In case you want to know there are numerous common colds related to coronavirus. This means many viruses out there will be very similar to Covid-19. But much of the media report it is not just a common cold. If that is true why is the mortality rate so low? Why do people who are dying of other complications re-classified as covid-19 even though the cause of death was not?

see https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3416289/

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