Seasonal influenza vaccines must be reformulated each year
to maintain protection. This requirement
reflects ongoing evolutionary changes in circulating influenza viruses that
affect how well prior immune responses recognise the virus.

Which explanation best accounts for the need to
update influenza vaccines annually?

Question

Seasonal influenza vaccines must be reformulated each year
to maintain protection.  This requirement
reflects ongoing evolutionary changes in circulating influenza viruses that
affect how well prior immune responses recognise the virus.

Which explanation best accounts for the need to
update influenza vaccines annually?

Answer

Gradual
changes in internal viral proteins reduce the effectiveness of immune memory

Answer

Progressive
variation in viral surface proteins alters key antibody targets over time

Answer

Annual
vaccine updates are required because influenza viruses undergo major genetic
replacement every year

Answer

Influenza
viruses completely evade existing immunity each season through rapid mutation

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Seasonal influenza vaccines must be reformulated each year to maintain protecti...

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