Methods Lineages of 331 influenza B viruses were characterized by haemagglutination
inhibition assay against standard reference ferret (Yamagata) and sheep (Victoria) antisera …

Influenza virological surveillance is an essential tool for early detection of novel genetic
variants of epidemiologic and clinical significance. The aim of this study was to determine …

Influenza B virus remains a major contributor to the seasonal influenza outbreak and its
prevalence has increased worldwide. We investigated the epidemiology and analyzed the …

During annual influenza epidemics, influenza B viruses frequently co-circulate with influenza
A viruses and in some years, such as 2005, large outbreaks have occurred while in other …

Background: Influenza B virus evolution is currently in a unique situation having two
cocirculating main lineages B/Yamagata/16/88 (YM/88)-like and B/Victoria/2/87 (VI/87)-like …

Influenza B viruses make a considerable contribution to morbidity attributed to seasonal
influenza. Currently circulating influenza B isolates are known to belong to two antigenically …

Since the 1980s, 2 antigenically distinct influenza B lineages have cocirculated in the world:
B/Victoria/2/87 (first appeared in the 1980s) and B/Yamagata/16/88 (became predominant in …

Influenza B viruses (IBV) are an important cause of morbidity and mortality during
interpandemic periods in the human population. Two phylogenetically distinct IBV lineages …

Objective: In order to understand the prevalence of influenza B virus, the antigenic,
resistance to antiviral medications, and genetic characteristics of influenza B viruses …

Methods A total of 126 HA1 sequences of strains isolated during 1940 to 2012 were
downloaded from the GenBank. Time of the most recent common ancestor (TMRCA) and …