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Noh, Ji Yun,Choi, Won Suk,Song, Joon Young,Lee, Han Sol,Lim, Sooyeon,Lee, Jacob,Seo, Yu Bin,Lee, Jin-Soo,Wie, Seong-Heon,Jeong, Hye Won,Heo, Jung Yeon,Kim, Young Keun,Park, Kyung Hwa,Kim, Shin Woo,Lee Elsevier 2018 Vaccine Vol.36 No.35
<P><B>Abstract</B></P> <P>We aimed to characterize the lineages of influenza B viruses obtained from clinical specimens during the 2007–2014 seasons in South Korea. RT-PCR for the partial hemagglutinin gene of influenza B virus was performed on laboratory-confirmed influenza B samples from the 2007–2008 season to 2013–2014 season. A phylogenetic tree was generated, and current influenza vaccine strains for the Northern Hemisphere were used as representative strains of Victoria and Yamagata lineages.</P> <P>A total of 571 influenza B virus sequences were analyzed. During the 2009–2010 season, most of the circulating influenza B viruses matched the vaccine strain; 91.0% (91/100) of viruses belonged to the Victoria lineage. In the 2007–2008, 2011–2012, and 2013–2014 seasons, co-circulation of each influenza B lineage was found with a match ratio to the vaccine strain of 53.2% (42/79), 40.9% (63/154), and 58.3% (134/230), respectively. Overall, 41.7% (238/571) of the circulating influenza B viruses belonged to the lineage mismatching the vaccine strain.</P> <P>During the seven influenza seasons, influenza B epidemics were substantial in four seasons in South Korea. Significant mismatches of the vaccine and lineage of the circulating influenza B viruses were found. The current trivalent influenza vaccine may not be fully suitable for effective protection against influenza B.</P> <P><B>Highlights</B></P> <P> <UL> <LI> During the 2007–2014 seasons, influenza B epidemics were substantial in 4 seasons. </LI> <LI> The lineages of influenza B viruses in South Korea were investigated. </LI> <LI> Rate of lineage mismatch of vaccine and circulating influenza B viruses was 41.7%. </LI> <LI> QIV may improve the vaccine effectiveness, especially in the high-risk groups. </LI> </UL> </P>