Mortality and course of infection in mice infected with P. berghei ANKA and/or T. cruzi G strain. Of three groups of C57BL/6 mice from the same batch, two were inoculated with T. cruzi metacyclic forms. Fifteen days later, P. berghei-parasitized erythrocytes were given to the uninfected (n = 6) and to one of the T. cruzi-infected group (n = 7), whereas one group remained infected with T. cruzi only (n = 6). A) Note the increased survival time in co-infected mice, as compared to the group infected with P. berghei only. B) Parasitaemia of P. berghei is expressed in percentage of parasitized erythrocytes and the values indicate the means ± SD. C) T. cruzi parasitaemias of individual mice are shown. Shown are the representative data from a set of experiments.