How Your Flu Jab Actually Got Made
For the 2019-20 flu season, more than 162 million doses of flu vaccines will be made in the US.
More than 100 national influenza centers constantly collect and analyzing flu strains for the next vaccine.
According to Business Insiders, flu viruses are 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 were inside a person.
After reviewing the data, several viral strains are chosen that will make up that year's flu vaccine.