Influenza A virus subtype H1N1(spanish flu)?

y did it become extinct? Did it mutate? If it did, y would it need to if it was so potent(killing 5% of the worlds population between 1918 and 1919)? What seperates it from other types of influenza?

Question #1: No. Immunization has helped decrease occurrence of cases but since this was a remote history of outbreak, current immunity has decreased.

Question #2: It's been found to have. H1N1 Asian swine flu was diagnosed in a human.

Question #3: Not exactly "needed" but viruses will do this anyway.

Question #4: What separates it is the glycoprotein structure. Influenza A causes most flus and the varous types have a surface proteins, gylcoproteins. These virus envelope glycoproteins are HA (hemagglutinin) and NA (neuraminidase). There are 16 HA antigens (glycoproteins are antigenic) and 9 NA antigens for influenza A.

Influenza A H1N1 has one HA and one NA. That alone separates it from other A types. Or did you mean how it's affects on humans separate it from other flu types?

Thanks for the best answer and sorry for all the typos. Report It

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