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Attempted infection of the rhesus monkey (Macaca mulatta) with the British horse strain of Echinococcus granulosus

Attention has been drawn to the fact that the occurrence of the cystic stage of Echinococcus granulosus in 60% of slaughtered horses represents a potential public health hazard (Thompson and Smyth, 1974). Williams and Sweatman (1963) regard this organism as a separate sub-species, E. granulosus equinus distinct from E. granulosus granulosus, but we prefer at this stage to refer to it as the horse “strain” which exhibits some small morphological differences from organisms of sheep origin.