Avian Home>Animal>Conditions_and_Diseases>Avian     Web Pages Mycoplasmal Conjunctivitis in Wild Songbirds: The Spread of a New Contagious Disease in a Mobile Host Population Report about the disease, particularly affecting House Finches. Vitamin A Deficiency in Birds Describes the most common preventable avian disease, Vitamin A deficiency or hypovitaminosis A, which particularly affects pet birds that eat only seeds. Understanding Psittacosis Article discusses the symptoms, control and treatment of Psittacosis in birds. Aspergillosis Aspergillosis is the most common fungal infection in birds. Short discussion of the disease, particularly in parrots. Proventricular Dilatation Disease (PDD) Viral disease originally called "macaw wasting syndrome", and also known as "psittacine wasting syndrome" or "neuropathic gastric dilation". Can occur in any psittacine. House Finch Disease Survey Monitors the occurrence of Mycoplasmal conjunctivitis, a disease that affects House Finches and other wild bird species in the United States and Canada. Site describes the disease and how to recognize it. Stop PDD Information and Campaign Site Information about proventricular dilatation disease, an fast-spreading infectious disease that kills many species of parrots and other birds, and solicitation of support for research on this disease and preventing its spread in the wild.