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Sexually Transmitted, Urinary Tract, and Gastrointestinal Tract Infectionsa 

Sexually Transmitted, Urinary Tract, and Gastrointestinal Tract Infectionsa
Chapter:
Sexually Transmitted, Urinary Tract, and Gastrointestinal Tract Infectionsa
Author(s):

M. Rizwan Sohail

DOI:
10.1093/med/9780190464868.003.0046
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date: 19 October 2019

Influenza causes annual, seasonal epidemics that lead to tens of thousands of deaths each year in the United States. Two influenza A strains (H3N2 and H1N1) and 1 or 2 influenza B strains typically circulate during winter months and undergo minor antigenic mutations (antigenic drift) resulting in annual seasonal epidemics. Influenza pandemics occur more rarely (every 20-30 years) and are the result of major antigenic changes (antigenic shift) leading to large numbers of infections due to low levels of population immunity. In seasonal epidemics, 80% to 90% of deaths due to influenza occur in persons older than 65 years.

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