Creating the flu vaccine involved injecting the virus into eggs, where it multiplied. The virus-laden embryonic fluid was then siphoned out, and the virus was killed. That purified fluid became the vaccine.
In this photo, Jeff Cesarone at the Merck Sharp and Dohme plant in West Point, Pa., explained the process.
![Making the vaccine against the Influenza Outbreak | 1957 [2560x1619]](https://i.redd.it/xrplkxlvbcn51.png)
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Creating the flu vaccine involved injecting the virus into eggs, where it multiplied. The virus-laden embryonic fluid was then siphoned out, and the virus was killed. That purified fluid became the vaccine.
In this photo, Jeff Cesarone at the Merck Sharp and Dohme plant in West Point, Pa., explained the process.