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Re:Covid-19 now exists in two forms, indicating it's already... by johnisgood on Thursday March 05, 2020 @10:35PM (#22500794)
While this is not exactly a direct answer to your question, these pages may be helpful:

https://shotofprevention.com/2018/03/14/how-flu-strains-are-...

https://www.cdc.gov/flu/about/viruses/change.htm

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