I have two pullets (1 four month old, 1 three month old) who both started sneezing and gasping several weeks ago. I had separated them from the rest of the flock and put them on Duramycin (almost 1/4 tsp per pint of water). Both started to get better, but now it has been 3 weeks and both are still sneezing, and depending on the day, still sound congested. One younger bird had periodically had "weepy" eyes through this, but the older bird never has. Both are eating, drinking and are relatively active. I've been feeding them yogurt in addition to pellets to help replenish their system. Their poop is normal with no signs of blood or other oddities. I know that it is recommended that the birds only go on antibiotics for 2 weeks, but I didn't want to let whatever they had win, so I kept them on for the 3rd week. I don't want to put them back into the rest of the flock until they are completely healthy (for obvious reasons), but the antibiotics just don't seem to be doing the trick. At this point though, I would love some advice or suggestions for what else to try or do.