Unfortunately, I was not aware and even worse, my veterinarians were not aware that both these bacteria can be considered normal in Cockatoos' fecal Gram Stain. My current Avian Vet would rather not treat these conditions unless the bird has other symptoms like messy poop, weight loss or acting sick. When I had both birds' poop tested, they both had significant yeast infections. C andida albicans is the scientific name for the yeast that can cause a variety of problems in the digestive tract of parrots. The digestive tract includes all the parts that food and liquid travel through from the beak to the vent in the bird.
Antibiotics kill the good bacteria along with the bad bacteria.
This was the reason that both my parrots had yeast infections. The results can sometimes be seen in the quality of the birds' poop. Sometimes it will be too watery and sometimes they will have true diarrhea. Yeast are not bacteria they are one celled fungi. Antibiotics are designed to kill bacteria.