I had an illness earlier this season after entering a few birds in a show. I used antibiotics to no avail in the beginning. After I lost a few birds and did more research, I found there was more to it than simply dropping a couple of teaspoons of powder in the water.
I scrubbed the loft daily removing the infected feces,changed to a small seed,low protien feed regimine,and used probios daily in the feed and water.
I spoke with another fancier who lost 30 birds. I consider myself lucky to have lost only 8. One has to be sure that the illness can be treated with antibiotics.
I seldom use antibiotics.
v99