| comparison of geographical strains of schistosoma mansoni in the mouse. | mice were killed 7, 11, 19, and 27 weeks after infection with strains of schistosoma mansoni from puerto rico, brazil, st lucia, and tanzania. the percentage recovery of adult worms was variable in different experiments and no consistent strain differences were observed. the prepatent period was prolonged in mice infected with the mwanza strain. significant differences were noted in the number of eggs per worm pair in the tissues, in the distribution of eggs in the tissues, and in the weight of ... | 1972 | 4537484 |