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'''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.
'''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.
==Sources==
[http://fhp.osd.mil/aiWatchboard/glossary.jsp?letter=D DOD Pandemic Influenza Watchboard]
[[Category:Medicine]]
[[Category:Medicine]]