The economic importance of Trematode infections of mammals has been, and is still, felt even in this country. Epidemic liver-rot in cattle and sheep is probably one of the most serious epidemic diseases with which veterinarians have had to deal and its ravages have, on occasion, been severe. Bilharziasis in cattle is possibly of considerably less importance and, so far as I am aware, has never become endemic in this country. As pathogenic agents the Amphistomes are of third-rate importance.
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William Nicoll (1923) studied this question.
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