Your Health October 21, 2013 Attack of the flu

{}{}{} Scientists have figured out how the flu attacks so many people and why you may experience it more than once in a season. {}{}{}{} Scientists at the Whitehead Institute for Biomedical Research found the flu virus attacks cells of the immune system known as memory B cells.{} These cells produce antibodies that can bind to the virus and neutralize it.{}{} However, the flu virus attacks these memory B cells first to disrupt antibody production, allowing it to replicate more efficiently and prevent the immune system from mounting a second defense.{}{}{}{}{} They say the virus targets memory cells in the lung, which allows infection to be established -- even if the immune system has seen this flu before.{}{}{}{}{} Researchers add this to the growing list of ways that the flu virus has to establish infection.