The use of guinea pigs as a laboratory model was proven to be appropriate in investigating the protective properties of a heterological immunoglobulin against Bolivian hemorrhagic fever at the preclinical stage of the study. A highly pathogenic Machupo virus strain that caused guinea pigs' death with respect with an agent's dose was cultivated. Injection of 1.0 ml of the immunoglobulin provided a 100% protective effect for the guinea pigs infected with the highly pathogenic Machupo virus strain in a dose of 10 LD50.
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