Ok, I'm back, when my one tiel was diagnosed with Giardia, I had to throw away all my area rugs, deep clean the whole house, disinfect the bird room daily for two weeks top to bottom, what a chore!! The vet prescribed " rinovet" to put in the drinking water for 2 weeks,,it turned the water blue..but they all drank it...just in case..,, when she was retested, it was negative,,,she was a rescue and most likely came with the Giardia..she had the dry flaking skin under her wings she picked it constantly, and it got so sore, I would put vitamin e oil and aloe vera on it..she was on baytril and metacam, once diagnosed correctly and treated ,,she was healed...sadly she passed soon after, coz she was a neglected, ill treated thing, took me 7 years to get her to trust me..