Abstract
The pathological changes in the proventriculi of fowls given monospecific experimental infection with Acuaria spiralis were characterized in the initial stages by an acute inflammation d due to the migration of 3rd and 4th stage larvae. There was a severe nonkeratinizing squamous cell metaplasia of the lining epithelium with pronounced granulocytic infiltration at 4–8 days post-infection. Multiple lymphoid nodules were evident in the lamina propria from 12 days post-infection. As the disease progressed there was extensive fibroplasia in the organ. By 50–100 days post-infection pedunculated fibroadenamatoid growths developed in the mucosa obliterating the entire lumen of the organ. A mortality rate of 29.16% of chicks (maximum on the 3rd week post-infection) was observed.
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