“Influenza B can be severe as well, but influenza A is the dominant version of influenza infecting people right now.” Both ...

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a virus type and subtype consistent with those of the index patient, and influenza symptoms meeting defined clinical criteria (see the Supplementary Appendix); the symptoms used to define whether ...

Other symptoms that signal an influenza attack ... There are three types of influenza viruses, types A, B and C with the latter being the mildest.