News Life Friendly fire blamed in some H1N1 deaths Study finds poorly targeted immune response in adults born after 1957 By Tina Hesman Saey December 6, 2010 at 6:45 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to print (Opens in new window) Print Faulty immunological memories could have made middle-aged people more susceptible to the 2009 H1N1 pandemic flu, a new study shows. Middle-aged people’s bodies tried to defend against H1N1 by hurling antibodies for similar viruses at the new flu.