Drift
This is the current revision of Drift as edited by DavidB4-bot (talk | contribs) at 11:47, July 13, 2016. This URL is a permanent link to this version of this page.
Drift is a process in which influenza virus undergoes mutation. The amount of change can be subtle or dramatic, but eventually as drift occurs, a new variant strain will become dominant. This process allows influenza viruses to change and re-infect people repeatedly through their lifetime and is the reason influenza virus strains in vaccine must be updated each year.