| http://www.w3.org/ns/prov#value | - INFLUENZA A is a common cause of serious respiratory illness in the elderly population.1 Among persons aged 65 years and older, rates of hospitalization for influenza range from 200 to more than 1000 per 100,000 population.1 Immunization with influenza vaccine has been shown to be 50% to 60% effective in preventing hospitalization and pneumonia, 80% effective in preventing death, and 30% to 40% ef
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