Why H3N2 flu feels so intense – and what to expect from the 4 distinct stages

The onset of H3N2 flu is often sudden and intense. Symptoms can develop within hours and include fever, chills, headache, ...
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The difference between cold and flu

Cold symptoms usually last between seven and 10 days. Flu symptoms are more severe and tend to develop suddenly. Influenza can lead to severe complications, especially in older adults, pregnant people ...