The possibility of the survival of guinea pigs after the simultaneous administration of different doses of Bacillus anthracis virulent strain 81/1 in combination with both B. anthracis vaccine strain STI and heterologous bacilli (B. subtilis strain PAC) has been experimentally shown. On the basis of the results of these experiments suggestion has been made that the "survival phenomenon" is the process involving the lysosomal systems of polymorphonuclear and mononuclear phagocytes.
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