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Comparison of the HA genes of type B influenza viruses in herald waves and later epidemic seasons

Published online by Cambridge University Press:  15 May 2009

S. Nakajima ,
F. Nishikawa ,
K. Nakamura  and
K. Nakajima
S. Nakajima*
Affiliation:
The Institute of Public Health, 4–6–1, Shirokanedai, Minato-ku, Tokyo 108, Japan
F. Nishikawa
Affiliation:
Saitama Medical School, Saitama 350–04, Japan
K. Nakamura
Affiliation:
Nagano Research Institute for Public Health and Pollution, Nagano 308, Japan
K. Nakajima
Affiliation:
Medical School, Nagoya City University, Aichi 467, Japan
*
*Address for correspondence: S. Nakajima, Department of Microbiology, The Institute of Public Health, 6–1, Shirokanedai 4 Chome, Minato-ku, Tokyo 108, Japan.
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Summary

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From January 1985 to May 1991, herald strains of influenza B virus were isolated in 1987 and 1989 in Japan. In both cases, influenza epidemics caused by the same type followed in the next winter season. The HA gene sequences of the influenza B viruses isolated in Japan from 1987–91, which covers two herald waves of influenza B viruses, were analysed and located on the phylogenetic tree for influenza B viruses after the B/Singapore/64 strain. Co-circulation of at least two evolutionary lineages of the HA genes existed for influenza B viruses in Japan during the period of this study. The herald viruses in one wave (1987) were genetically close to the winter isolates and were considered to be the parental viruses for the following influenza season, while in the other wave (1989) winter isolates belonged to another lineage on which one of the herald viruses was located, but they were genetically and antigenically different from the herald viruses.

Type
Research Article
Information
Epidemiology & Infection , Volume 109 , Issue 3 , December 1992 , pp. 559 - 568
Copyright
Copyright © Cambridge University Press 1992

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