The part where he referenced the chicken vaccine gave me chills. As a poultry farmer, I cannot mix vaccinated vs unvaccinated birds. I learned that the hard way.

in China they deliberately use leaky Avian Flu vaccines to quickly cull flocks of chicken, because the unvaccinated die within three days. In Marek’s Disease, from which they needed to save all the chickens, the only solution was to vaccinate 100% of the flock, because all unvaccinated were at high risk of death.