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Avian Nephritis Viral Infection
Avian nephritis viral (ANV) infection is caused by a highly-contagious astrovirus which affects chickens, ducks, geese, and turkeys worldwide. ANV infection predominately affects the bird's kidneys, resulting in renal damage and visceral urate deposits due to gout. Sometimes the virus targets the intestines.
Chickens become infected with ANV through direct or indirect contact with the feces of infected birds.
Supportive care: Isolate the bird from the flock and place in a safe, comfortable, warm location (your own chicken "intensive care unit") with easy access to water and food. Limit stress. Call your veterinarian.