Newcastle disease virus pathotypes

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Abstract
The clinical signs, mortality and postmortem findings following infection of six‐week‐old chicks with nine strains of Newcastle disease virus were studied. Although strains could be divided into four pathotypes the divisions were not clear‐cut. The most prominent feature of disease following infection by two isolates from the post‐1970 USA epidemic, a 1962 UK isolate and a 1972 UK isolate were haemorrhagic gut lesions. A virus isolate from the post‐1970 UK epidemic, Lamb‐Essex ‘70, rarely caused gut lesions in infected birds although this was the only strain to consistently induce oedema of the eye in infected birds.

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