Abstract
The prefemoral lymph nodes of two calves and a sheep infected with a stock of Trypanosoma congolense transmitted by Glossina morsitans were examined histologically for the presence of trypanosomes. Ten days after infection trypanosomes were found in the subcapsular sinuses of the nodes of a calf and the sheep but parasites were absent from the blood at this time. Trypanosomes were also detected in the prefemeral lymph node of the other calf on examination 30 days after infection, when parasites were also present in the blood. These observations provide further evidence that extravascular foci of trypanosomes develop in infections with T congolense and indicate that it should not be regarded as a strict plasma parasite.
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