The winter flu season features two types of influenza. Here's what you need to know about them and how they differ.
19hon MSN
Influenza levels in the US are the highest they've been in 15 years amid winter weather and a second wave of the virus.
The U.S. influenza rate is at or near its highest level in at least 15 years and is still on the rise, the U.S. Centers for ...
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