CDC Releases Information on 2019-2020 Seasonal Influenza Flu Vaccine
According to the US Centers for Disease Control and Prevention (CDC), for the 2019-2020 influenza season, trivalent (three-component) vaccines are recommended to contain:
- A/Brisbane/02/2018 (H1N1)pdm09-like virus (updated)
- A/Kansas/14/2017 (H3N2)-like virus (updated)
- B/Colorado/06/2017-like (Victoria lineage) virus
Quadrivalent (four-component) vaccines, which protect against a second lineage of B viruses, are recommended to contain:
- the three recommended viruses above, plus B/Phuket/3073/2013-like (Yamagata lineage) virus.
The World Health Organization (WHO) made the selection of the H1N1 and both B components for 2019-2020 Northern Hemisphere flu vaccines on February 21 and at that time decided to delay the decision on an H3N2 vaccine component.
The FDA’s Vaccines and Related Biological Products Advisory Committee (VRBPAC) also selected the H1N1 and B components at their first meeting on March 6, but also decided to postpone the selection of the H3N2 component.
WHO selected the H3N2 component listed above on March 21, 2019. VRBPAC chose the same H3N2 component for U.S. vaccines on March 22, 2019.
According to the CDC, it is too soon to say how the delay in the selection of the H3N2 candidate vaccine component may affect the timing of vaccine availability for the 2019-2020 flu season. Private manufacturers in the United States produce flu vaccines each season. Once the viruses are selected for the new vaccine formulation, manufacturers operate under a tight timeline for producing, testing, releasing and distributing flu vaccine. CDC and other federal partners will continue to coordinate and collaborate with U.S. flu vaccine manufacturers to monitor production and vaccine availability timelines, StayAlert! will publish additional information as it becomes available.
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