i contacted a vet and relayed the symptoms which were serious one eyed blindness when an eye turns milky white swollen wing buts (unable to fly ) y/bs dying in the shell just as they are due to hatch and dying in the nest at a few days old lameness in thier legs i was advised that with these symptoms it was para,e coli, sammonella another fancier advised me to use parastop and i never looked back i treat every year after the moult as im not going to have that happen to my birds again i had to remove most of my stock birds and a good few racers dave