Genes may explain who gets sick from flu

Infection can activate two dramatically different responses

By Tina Hesman Saey, 16:19 PM August 24, 2011

The difference between staying well and suffering days of misery depends on which of two contradictory ways the immune system reacts to infection by the flu. One strong reaction releases inflammatory chemicals leading to sickness, researchers report online August 25 in PLoS Genetics. An equally strong but opposite reaction produces anti-inflammatory compounds and fights off the flu without producing symptoms. 

Most of what researchers know about influenza’s effect on people comes from stud...

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