Introduction
Influenza B virus, a member of the Orthomyxoviridae family, exclusively infects humans and seals. Unlike Influenza A virus, its mutation is limited to genetic drift and reassortment. Influenza B virus evolves at a slower rate compared to Influenza A and a faster rate compared to Influenza C. While Influenza B virus mutates at a rate 2-3 times slower than type A, it still undergoes sufficient mutations to prevent long-lasting immunity. This enveloped virus has a virion structure consisting of a matrix protein, envelope, nucleoprotein complex, nucleocapsid, and polymerase complex. Its morphology can be either spherical or filamentous. The approximately 500 surface projections are composed of hemagglutinin and neuraminidase. The Influenza B virus genome comprises 14,648 nucleotides, organized into eight linear, negative-sense, single-stranded RNA segments. Each segment is enclosed within a separate nucleocapsid, all of which are surrounded by a single envelope.
Description
This product consists of allantoic fluid derived from 10-day-old embryonated eggs inoculated with the B/Qingdao/102/91 strain of Influenza B virus. The virus was purified using ultracentrifugation with a 10-40% sucrose gradient.
Inactivation
This product has been inactivated with Thimerosal and beta-propiolactone treatment. Standard microbiological/viral safe handling practices and techniques are required when working with this product.
Physical Appearance
A sterile-filtered, colorless solution.
Formulation
The B/Qingdao/102/91 solution is formulated with 0.1M NaCl, 10mM Tris HCl, 1mM EDTA (pH 8), 0.1% sodium azide (NaN3), and 0.005% thimerosal.
Stability
For optimal stability, store B/Qingdao/102/91 below -18°C. While it can remain stable at 4°C for up to 4 weeks, it's important to avoid repeated freeze-thaw cycles.
Purity
The purity of this product is greater than 90%, as determined by SDS-PAGE analysis.
Immunological Activity
Serological studies of influenza B virus, immunogen for antibody production.
Tested with anti-influenza B monoclonal antibodies in ELISA.