Recovery rates of T. cruzi bloodstream forms subjected to several methods of cryopreservation in liquid nitrogen and at -73 C are reported. Inoculations of animals with cryopreserved and nonpreserved trypomastigotes revealed that prolonged storage at -196 C apparently did not change the biologic characteristics of different T. cruzi strains. The reproducibility and consistency of results suggest that "cryobanks" or "reference centers" may be established.
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Filardi et al. (1975) studied this question.
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