Preliminary accounts on the pathology of Schistosoma nasale infections in cattle were described by Datta^<1)>, and a detailed description of the pathological features in infected animals was given by De Bont et al^<2)> . In the present paper, pathological features caused by S. nasale collected at an abattoir in Colombo, Sri Lanka were described. The pathological lesions obtained here were categorized according to the typing by De Bont et al^<2)> . Tissue A was control (uninfected). Tissue B showed general inflammation, granuloma formation and small ulcers with severe bleeding, corresponding with type III in the descriptions by De Bont et al^<2)>. Tissue C showed numerous nodular areas and strong general inflammation, suggesting type IV , and tissue D showed cauliflower like growths, numerous, and confluent nodular areas, ulcers, strong inflammation, and extensive loss of mucosal epithelium, indicating type V . Although descriptions of pathological features in this study were all derived from naturally infected animals, time of infection and of oviposition can be inferred due to differences in tissue features and due to kinds of infiltrated cells surrounding lesions.
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