[Influence of the cryopreservation at nitrogen temperature on the vaccinic ability of the "PF" strain of Trypanosoma cruzi (author's transl)]. / Avaliação da influência da cariopreservação a--196 degree C na capacidade "vacínica" da amostra "PF" do Trypanosoma cruzi.

ABSTRACT

The cryopeservation of the "PF" strain of T. cruzi at -196 degree C has not changed its effectiveness in protecting mice against a posterior infection with a virulent Trypanosoma cruzi strain. The cryopeservation technique utilized seems to be efficient and of practical and rapid examination.