Epidemiological Analysis of Influenza B Virus Belonging to B/Victoria/2/87 Lineage Isolated in Off-Season of 1998 and Late Epidemic Season in Shizuoka Prefecture

Sahara, Keiji; Sugieda, Masaaki; Nagaoka, Hiromi; Miwa, Yuko; Miyamoto, Hideki; Akiyama, Masato; Nakajima, Setsuko; Nerome, Reiko

doi:10.11150/kansenshogakuzasshi1970.74.481

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“…We then postulated that the primary reason for the influenza B V-lineage epidemic in the 2001-2002 season was the existence of the herald virus at the end of the previous season. Although the herald wave phenomenon is not always observed [16][17][18], this observation is useful information for predicting forthcoming influenza epidemics. Based on the same theory, we predicted that there would be a Y-lineage epidemic in the 2002-2003 season, as we detected four Y-lineage viruses in March and April 2002 and we observed an antigenic drift in these strains compared to the standard antigen in human sera as shown in Figure 4.…”

Section: Discussionmentioning

confidence: 96%

Epidemics of two Victoria and Yamagata influenza B lineages in Yamagata, Japan

et al. 2004

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We attempted to predict epidemics of influenza B, focusing on B/Victoria/2/87-like (V) and B/Yamagata/16/88-like (Y) lineages, in Yamagata, Japan. We collected 9624 nasopharyngeal swabs for virus isolation from patients with respiratory infections between 1996 and 2003 and 237 sera for seroepidemiological analysis by haemagglutination-inhibition test in 2001. We isolated 424 V-lineage and 246 Y-lineage viruses during the study period. Three herald viruses in the 2000--2001 season enabled us to predict a V-lineage epidemic in the following season. However, another V-lineage epidemic occurred in the 2002--2003 season, although we caught four herald Y-lineage viruses, whose antigenic drift was suggested by seroepidemiological study, at the end of the previous season. Since the epidemiology of the two influenza B lineages remains unclear, a careful watch should be kept on these lineages in order to provide effective public-health strategies against future epidemics.

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Section: Discussionmentioning

confidence: 96%