
A possible explanation for why middle-aged adults were hit especially hard by the H1N1 influenza virus during the 2013-2014 influenza season has been uncovered by scientists. Their findings offer evidence that a new mutation in H1N1 viruses potentially led to more disease in these individuals.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/JQgsVLXs1YQ/141021101516.htm