Eggs contaminated with salmonella would never be used for a vaccine.
Eggs used for vaccine come from dedicated flocks, which are maintained in a pathogen free environment. People taking care of chickens that produce vaccine eggs must wear protective clothing to prevent passing disease to the chickens.
Last year I was staying with my cousin in Oklahoma and her family. After I was there a few days I asked her 20 something year old son why he never showered. Lol. He said I take at least 10 showers a day at work. I knew he worked for Tyson, what I didn’t know was he inseminated chickens. Shower and protective clothing before entering any of the insemination facilities.
Her husband works for google so showers there. I knew that so didn’t ask. Lol