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influenza epidemic

   Also found in: Wikipedia 0.01 sec.
influenza epidemic
caused 500,000 deaths in U.S. alone (1918–1919). [Am. Hist.: Van Doren, 403]
See : Disease


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According to the World Health Organisation, influenza epidemics occur yearly during autumn and winter in temperate regions.
World Health Organization Annual human influenza epidemics occur because the influenza viruses change their antigenic structure ('antigenic drift') to produce new strains that can cause infection in persons who have been previously infected or vaccinated with different strains.
Timesonline quoted the scientists as writing: "During influenza epidemics there are many deaths and serious complications in vulnerable populations.
 
 
 
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