In the past... we'd just eat the eggs, get the flu, spread it about a bit, take a day / week off work, go back to work. You know, normal life. Now we overreact and just cull all the eggs and/or chickens and jack the prices up. It seems kind of weak tbh. You're never going to purify the world and make it perfect. One day someone in the future is going to say, "Ew they ate real food instead of processed food pellets?" unironically.

Then a disease will arrive that will make the entire population vanish because their immune systems never had to interact with anything.