[Experimental endoparasitism of Trypanosoma brucei in Blabera fusca: parasite survival and hemoglobin toxicity].

Attempts for infestation of the cockroach, Blabera fusca, by Trypanosoma brucei directly inoculated in the insect's haemocoele allowed to prove the obligation of the presence of red cells in the cockroach for the survival of the flagellates, in variable assessment. These free and moving trypanosomes may be studied in the haemolymph by an original in vivo observation technic; they have few pathogenic effect on the insect but remain infectious for mice. Moreover, haemoglobin shows a direct toxic effect in the cockroach, which enlarges by destroying red cells after encapsulation by haemocytes.