[The study of protective properties of attenuated strain of Argentinian hemorrhagic fever].

Immunization of BALB/c, C57BL/6, CBA/calac mice with strain XJ44 of Argentine hemorrhagic fever resulted in changes of nonspecific immunity parameters, such as interferon, interleukin-1, tumor necrosis factor, and natural killers. The formation of a specific humoral and cellular immune response in BALB/c mice immunized with this strain has been demonstrated. Immunization of BALB/c mice with strain XJ44 protected the animals from infection with a heterogeneous strain Carvallo of Bolivian hemorrhagic fever.