The virus-inhibiting and immunostimulating activity of Soviet preparations, maleic anhydride copolymers, was demonstrated in alpha-, flavi-, and bunyavirus infections. Positive results were obtained in subcutaneous and intraperitoneal inoculations of the preparations used in prophylactic and therapeutic-prophylactic schedules. Stimulation of vaccination immunity was observed after combined use of copolymers and the vaccine against Eastern equine encephalomyelitis.
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