Throughout most of the last decade, B/Yamagata/16/88‐lineage influenza viruses were
predominant among the B isolates circulating worldwide, whereas B/Victoria/2/87‐lineage …

Co-circulation of two influenza B virus lineages, B/Yamagata and B/Victoria, has been
recognized since the late 1980s. The assessment of the prevalent lineage and the group of …

Aims: To analyse the epidemiological and molecular features of a long-lasting epidemic (12
weeks) of influenza in north-eastern Italy during the 2004–05 season. Methods: Morbidity …

Influenza B viruses have recently undergone significant genetic variations, including
antigenic drift and antigenic shift, such as reassortment. We have characterized these …

To characterize the antigenic and genetic relationships of influenza B viruses isolated during
the 2004–2005 season, a total of 11,707 clinical respiratory samples were tested of which …

While influenza A viruses comprise a heterogeneous group of clinically relevant influenza
viruses, influenza B viruses form a more homogeneous cluster, divided mainly into two …

Background Here, we genetically and antigenically analyzed influenza B viruses (IBVs)
isolated in Japan during the 2017‐2018 and 2018‐2019 influenza seasons. Methods A total …

Background Two antigenically and genetically distinct lineages of influenza B viruses
(B/Victoria and B/Yamagata) have been co-circulating worldwide since 2002. Virological …

Understanding Influenza B virus infections is of critical importance in our efforts to control
severe influenza and influenza-related diseases. Until 2020, two genetic lineages of …

Co-circulation of two evolutionary distinct lineages of influenza virus in one epidemic season
has led to development specific reagents for rapid identification and typing of new isolates …