Introduction - University of Southern California
Most common recent seasonal Influenza A subtypes: H3N2 and H1N1 (not the same as novel H1N1 or “swine flu”) Strains of Influenza A: further broken down, usually named by place first detected (A/ California /04/2009) Influenza B viruses circulate widely only among humans. Has 8 RNA segments. ................
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