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Mice infected with Trichuris muris and then challenged with Entamoeba histolytica trophozoites by intracecal injection showed a higher rate of amebic infection and were more susceptible to amebic tissue invasion compared with controls. Amebic ulceration occurred principally at the site of attachment of the Trichuris worms to the cecal mucosa. The possible mechanisms of this interaction and its relevance in man are discussed.
Accepted for publication December 29, 1973.
* This study was supported by a grant from the Medical Research Council, London.
Present address: Department of Tropical Medicine, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, England.
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