Comparative Observations on Experimental Schistosoma mansoni Infections in African Green and Rhesus Monkeys

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Abstract
The pattern of egg excretion and the number of schistosomes are compared in five African green (Cerco-pithecus aethiops pygerythrus and C. aethiops sabaeus) and five rhesus monkeys. Egg excretion in the green monkey was lower during the acute phase and declined more slowly thereafter. The green monkeys maintained a significantly higher number of worms over a period of many months. The number of eggs passed by green monkeys during chronic infections was much less than would be expected from the number of live worms recovered at autopsy.