and adults older than 65 are most at risk for severe flu symptoms. The difference between influenza A and B, another type of flu virus, is that A is typically more common and severe. Influenza A ...
Influenza B viruses, however, only circulate in humans ... If you do get sick with the flu, the most common symptoms include a sudden onset of fever, chills, muscle aches, fatigue and respiratory ...
Scientists always include one strain of influenza B in the annual flu vaccine. You may have only mild symptoms or no symptoms at all if you are infected with an influenza C virus. This category of ...