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There are many diseases and infections common between humans and birds. One particular digestive disorder in birds that is also seen in humans, especially babies, is yeast infection Candidiasis (or thrush).
Candidiasis can affect multiple organs. The most common sites of infection are the crop (the storage place for food prior to digestion), stomach and intestines. However, other organs like the skin, respiratory tract, mouth and nose, and central nervous system may be infected, too.
The visible signs of Candidiasis disease, include:
Adult birds that do not have an aggressive form of the infection may not show any signs of the disease at all. Young birds, conversely, may have the infection spread to its blood, bone marrow and deep organs.
Candidiasis is caused by the yeast, Candida albicans, and is commonly found in the environment or in the digestive tract of the birds.
When the immunity of the bird is low, the yeast causes secondary infection of Candidiasis. The immunity of the bird may be weakened due to many reasons, including:
A type of fungus that produces buds
A type of slime that is made up of certain salts, cells, or leukocytes
The whole system involved in digestion from mouth to anus