This annual replace of the viruses contained in influenza vaccines is important for them to be efficient.
The World Health Organization (WHO) has introduced its suggestions for the composition of influenza vaccines within the 2023-2024 influenza season within the northern hemisphere.
This annual replace of the viruses contained in influenza vaccines is important for them to be efficient, as a result of fixed evolution of influenza viruses, together with those who flow into and infect people.
The WHO has organized a 4-day assembly, which is held twice a yr, to debate the composition of those vaccines. An advisory group of specialists participates in these choices. These suggestions are then utilized by nationwide vaccine regulatory authorities and pharmaceutical firms to develop, produce, and license influenza vaccines for the next influenza season.
Thus, the WHO recommends that egg-based quadrivalent (with 4 viruses) vaccines used within the subsequent flu season comprise a virus much like A/Victoria/4897/2022 (H1N1)pdm09; a virus much like A/Darwin/9/2021 (H3N2); a B/Austria/1359417/2021-like virus (B/Victoria lineage); and a B/Phuket/3073/2013-like virus (B/Yamagata lineage).
As for vaccines based mostly on cell cultures or recombinants, they need to be composed of a virus much like A/Wisconsin/67/2022 (H1N1)pdm09; a virus much like A/Darwin/6/2021 (H3N2); a B/Austria/1359417/2021-like virus (B/Victoria lineage); and a B/Phuket/3073/2013-like virus (B/Yamagata lineage).
In the case of trivalent vaccines (three viruses), these produced from eggs must be composed of a virus much like A/Victoria/4897/2022 (H1N1)pdm09; a virus much like A/Darwin/9/2021 (H3N2); and a B/Austria/1359417/2021-like virus (B/Victoria lineage).
For their half, vaccines based mostly on cell or recombinant cultures may have, in response to the WHO, a virus much like A/Wisconsin/67/2022 (H1N1)pdm09; a virus much like A/Darwin/6/2021 (H3N2); and a B/Austria/1359417/2021-like virus (B/Victoria lineage).