jem23 wrote:
which strain of influenza virus(a,b or c) causes the large epidemics due to genetic drift?
Haven't found this anywhere, but i'd go with A
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| vallia
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I think it is strain A
are you refering for pandemic or epidemic?
antigenic shift is the origin for pandemic desease and antigenic drift is for seasonal epidemic desease.The strain A undergo both changes(drift and shift) but B strain only changes by antigenic drift.
Influenza A cause moderate to severe ilnesses, affects all ages groups, infects human and animals(pigs and birds). The antigenic shift (pandemic) occurs primarily when both animal and human strains are involved.
Influenza B cause moderate desease in children, milder epidemics due to drift mutation, affects only humans. Influenza B is incidentaly isolated in the epidemics with A strains , less than 1% of the total izolated strains.
Influenza C cause rarely desease in humans, no epidemics.
http://www.cdc.gov/flu/about/fluviruses.htm
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| bactitech
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Great explanation, Vallia. I understand bacteria a LOT better than viruses, as I've never worked with the latter. That cleared some things up for me and other people as well, I'm sure. 
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