Pretty sure Tylan (tylosin) is not used to treat e. Coli.From my own experience this cured my chicks as they may also have a bacterial infection at the same time and every time a chick gets sick does not mean it has cocidiosis! My chicks were acting the same way and the corid did not help them but the tylan did! It can be used to treat other things besides mg or ms buy the way. My avian vet gave me this info herself its also used to treat ecoli and samonella infections and yes the injectable form may be hard on them I also said it whould be easier to administer it orally
-Kathy