"The morbidity and clinical attack rates produced by pandemic influenza have received much less attention than has excess mortality. In other words, the attention has been focused on the groups of persons who are most vulnerable to complications and death as a result of influenza virus infection. For most pandemics, those at greatest risk are the elderly and the very young. These same persons are, for the most part, at the end of the transmission chain; they are not introducers of influenza into the household . Therefore, immunization of these persons may reduce mortality and serious illness but will have little effect on the course of the epidemic. The fires of the epidemic are fed by healthy susceptible school children, college students, and employed persons who have many daily contacts and who are more mobile."
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https://en.wikiquote.org/wiki/Influenza
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Influenza
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