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Common Viral Diseases of Pet Birds (African grey parrots) —-Avian Polyomavirus
Avian polyomavirus (APV) causes disease in young parrots. There are two forms of the disease based on affected species: budgerigar fledgling disease and non-budgerigar polyoma infection. Both are characterized by peracute to acute death of preweaned neonates. Clinical signs occur 7–10 days after exposure and include lethargy, crop stasis, and death within 24–48 hours. Surviving