One died two days after purchase, and was diagnosed at necropsy-
the poor guy was full of the bacteria/fungus. He was extremely
underweight although he was eating all the time (since he was eating
lots, I thought he was fine), which I understand are classic symptoms.
The vet showed me the slide under the microscope, the slide was filled
with it.
My budgie right now has it (the vet took a stool sample and looked
under a microscope for the microbe), I am treating him right now,
The symptoms can be any combination of: weight loss, vomiting,
difficulty swallowing, eating without food going down, or no symptoms
other than poor weight gain.
The only treatment known to work is Amphotericin B, a prescription
antibiotic. If an avian-certified vet is available, having the bird
checked is certainly preferable to possibly misdiagnosing it.
In an emergency, you could ask your nearby vet to consult with a
board-certified avian specialist. I have a local board-certified avian
specialist who always fits me in that day if it's serious.
I bought a gram scale to watch his weight.
I see that this is an old e-mail, how did your budgie do?