Health & Body
How the Flu Vaccine Is Made and Why It Changes Every Year
The flu vaccine changes yearly because flu viruses mutate and protection fades. How strains are picked and how egg, cell and recombinant shots are made.
Space, Earth and the natural world, explained.
The flu vaccine changes yearly because flu viruses mutate and protection fades. How strains are picked and how egg, cell and recombinant shots are made.
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