Influenza B [B/Washington/02/2019] Hemagglutinin (HA), His-Tag

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This Influenza virus hemagglutinin protein is derived from the HA sequence of B/Washington/02/2019, expressing aa 1-545, and fused with a polyhistidine tag at the C-terminus. The influenza virus hemagglutinin protein is expressed in HEK293 cells. This virus is recommended by WHO for inclusion in the quadrivalent and trivalent vaccines for use in the 2020 – 2021 northern hemisphere influenza season.



  • Recombinant Influenza B/Washington/02/2019 Hemagglutinin (HA) (NCBI Accession Number: QCG86180.1), amino acids 1-545 and a C-terminal His-tag.
  • Expressed in HEK293 cells, and purified from culture supernatant by immobilised metal affinity chromatography and buffer exchange.
  • Presented as liquid in DPBS and greater than >95% purity by SDS-PAGE.



Influenza B virus is the only species in the genus Betainfluenzavirus in the virus family Orthomyxoviridae. Influenza B virus is only known to infect humans and seals and this is believed to account for the lack of associated influenza pandemics in contrast with those caused by the morphologically similar influenza A virus, although both mutate by both antigenic drift and reassortment. However, it is thought that Influenza B virus could cause significant morbidity and mortality worldwide, particularly in adolescents and schoolchildren. WHO convenes technical consultations in February and September each year to recommend viruses for inclusion in influenza vaccines for the northern and southern hemisphere influenza seasons, respectively. Flu vaccines are based on predicting which mutants of H1N1, H3N2, H1N2, and influenza B will proliferate in the next season. Separate vaccines are developed for the Northern and Southern Hemispheres in preparation for their annual epidemics. One influenza A (H1N1), one influenza A (H3N2), and one or two influenza B viruses (depending on the vaccine) are included in each season’s influenza vaccines (CDC, 2019). WHO has identified four strains as the most likely to circulate in the 2020-2021 influenza season, including Influenza B [B/Washington/02/2019] virus.



    • Centers for Disease Control and Prevention (CDC). (2019). Influenza (Flu).
    • World Health organisation (WHO). Influenza. Recommended composition of influenza virus vaccines for use in the 2020 – 2021 northern hemisphere influenza season (2020).