Influenza A viruses visible generally during the wake of spring and winter. However, influenza B can be visible at any time of the year. As such, it is possible to have both at the same time though its rare and perplexing.

TAGS: What is influenza B? What is is influenza type b? When was the influenza A and B discovered? Is influenza a the same as swine flu? Is type a influenza the same as H1N1?

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