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 studies of people who are already sick. But Alfred Hero and his colleagues wanted to know how some people seem to be able to avoid getting sick. The researchers infected 17 volunteers with a strain of seasonal flu called H3N2/Wisconsin.
Note: To comment, Science News subscribing members must now establish a separate login relationship with Disqus. Click the Disqus icon below, enter your e-mail and click “forgot password” to reset your password. You may also log into Disqus using Facebook, Twitter or Google.