FRED M. DAVENPORT, M.D.; ALBERT V. HENNESSY, M.D.
In February, 1957, viruses belonging to a previously unrecognized family of influenza A strains emerged from North China and within four months were disseminated throughout the globe.1, 2 The seeding of the world's population by what is now called Asian influenza was followed at various intervals by sharp outbreaks associated with a high attack rate.
A major antigenic rearrangement, resulting in the appearance of another family of strains, is not a new phenomenon. With the passage of time, four successive shifts have occurred, followed, respectively, by the four successive periods of prevalence of swinelike, A, A-prime, and now Asian strains.
DAVENPORT FM, HENNESSY AV. THE CLINICAL EPIDEMIOLOGY OF ASIAN INFLUENZA1. Ann Intern Med. ;49:493–501. doi: 10.7326/0003-4819-49-3-493
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Published: Ann Intern Med. 1958;49(3):493-501.
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