What are the symptoms(sp) if any? Sneezing? Wheezing? The one with the swollen head/eyes i would give tylan 50 injectable 1/4 cc. for bantams 1/2 cc. for standards, i believe that is the correct dosage. Need more info though.
I had one that had the eye swelling thing, actually had a calcium blob in there I put my finger towards the front part of her eye and rolled my finger backwards towards her neck and the thing just popped right out from her tear duct. I used some eye drops the dr had given me when I had a scratch in my eye. Cleared up in 2 days.
I don't have a 100% clue what causes it but I my gut instinct was the dirty drinking water in one of the waterers(the ducks had access to it and it was the fav place to drink)
. I locked out the ducks from the chicks. I bleached all of the feeders and waterers, rinsing them very well. I started making sure it was changed every SINGLE DAY and this problem cleared up. I also put in medicated water for a few days.