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The assay of the molluscicide niclosamide using the ciliate protozoan Spirostomum ambiguum.

Since the conditions for the BIIT were established arbitrarily, it is necessary to define more precisely the points at which, in terms of the many factors involved in the test, T. brucei (sensu stricto) trypanosomes lose their infectivity to rats. Two of these factors, i.e., incubation time at 37°C and the ratio of human to positive rodent blood in vitro, were initially examined in checker-board titrations. These showed that, with incubation for 5 hours at 37°C, a human blood to positive rat blood ratio of 4: 1 was sufficient to prevent infection of the inoculated rats by any of the T. brucei strains used. When samples were tested at very high and very low levels of parasitaemia, the positivity patterns for the inoculated rats indicated that the infectivity level of the trypanosomes had, in both instances, been markedly diminished. This serves to underline the recommendation for the use, in the BIIT, of a medium and rising parasitaemia in the donor rats or mice of the strain under test (See note 4 above).