How the flu vaccine is made
will be made in the US, alone. The vaccines start with the viral strains themselves, which are mostly grown and cultivated in either fertilized hen eggs or egg-free cell cultures.While flu vaccine may be widely distributed only during, creating it is a year-round process. There are more than 100 national influenza centers in more than 100 countries constantly collecting and analyzing influenza virus strains for the next vaccine.
The most common are flu types A and B, which is why each year the flu vaccine contains strains of both types A and B viruses. For example, the 2019 flu vaccine contains strains of H1N1 and H3N2 — which both cause flu type A — and two flu type B strains, called B/Victoria and B/Yamagata. Each viral strain is either injected into an egg or added to cell culture. Then the viruses are given a few days to replicate and grow, just as if they wereAll the while, the eggs and cultures are handled under sterilized conditions. For instance, the egg yolks are inoculated with viruses under ultraviolet light and in an area absent of dust and other contaminants.
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