MS is a chronic respiratory and joint disease from mycoplasma synoviae. It is contagious and causes swollen leg and ankle joints, and pain. The respiratory symptoms may be milder than mycoplasma gallisepticum or MG. It is hard to treat or irradicate from your flock, since survivors may be carriers. Lysteria is something I know we can get from uncooked weiners, but I don’t know anything about the type that chickens get. In Merck Vet Manual, they say it can affect the heart, spleen, kidneys, and brain. We can get it from eating uncooked poultry. Here is the article to read:
https://www.merckvetmanual.com/poultry/listeriosis/listeriosis-in-poultry
I would probably wait to add or hatch new chickens to the flock until after all of these affected chickens are gone, waiting several weeks to get healthy baby chicks from a hatchery. That is the best way to handle common contagious diseases in flocks, so the disease does not get passed on.