A condition caused by infection by the Newcastle disease virus, which may be characterized by conjunctivitis, respiratory illness, and diarrhea.

Newcastle disease is a contagious bird disease affecting many domestic and wild avian species; it is transmissible to humans. It was first identified in Java, Indonesia, in 1926, and in 1927, in Newcastle-upon-Tyne, England (whence it got its name). However, it may have been prevalent as early as 1898, when a disease wiped out all the domestic fowl in northwest Scotland. Its effects are most notable in domestic poultry due to their high susceptibility and the potential for severe impacts of an epizootic on the poultry industries. It is endemic to many countries.

A viral infectious disease that results_in infection in birds and humans, has_material_basis_in Newcastle disease virus, which is transmitted_by contact with feces and urine of an infected bird, or transmitted_by fomites. The infection has_symptom conjunctivitis, has_symptom headache, and has_symptom lacrimation in humans, and has_symptom gasping, has_symptom coughing, has_symptom twisting of head and neck, has_symptom circling, has_symptom complete paralysis, has_symptom watery diarrhea, and has_symptom reduced egg production in birds.