Multiple treatments with carboxymethylcellulose-polylysine-complexed poly(I).poly(C) significantly increased protection against encephalomyocarditis virus in mice compared to a single treatment.
Absolute Event Rate: 0.16% vs 0.37%
p-value: p=<0.01
Treatment of mice with polyinosinic acid . polycytidylic acid poly(I) . poly(C) 6 h before infection and once daily on days 1, 2, 3, 4, 7, and 10 after infection with encephalomyocarditis virus was found to confer no additional protection as compared with a single treatment 6 h before infection. When complexed with a colloid formed between carboxymethylcellulose and polylysine, poly(I) . poly(C) conferred significant additional protection with the multiple treatment regimen compared with a single treatment of 6 h before infection. The additional antiviral activity of multiple treatments could not be entirely attributed to interferon induction by the complexed form of poly(I) . poly(C), because free and complexed poly(I) . poly(C) both caused hyporesponsiveness to interferon induction after multiple treatments. However, mice protected against encephalomyocarditis virus infection by multiple treatments with the colloidal complex form of poly(I) . poly(C) showed a significant increase in resistance to reinfection, and this was attributable to adjuvant effects of the colloidal complex form of poly(I) . poly(C). The contribution of interferon induction and adjuvanticity of the poly(I) . poly(C) formulations varied with the times of treatment relative to infection, the dose of polynucleotide material, and the virus dose.
Stebbing et al. (1980) studied Encephalomyocarditis virus infection. poly(I).poly(C) complexed with carboxymethylcellulose-polylysine vs. Single treatment 6h before infection or free poly(I).poly(C) was evaluated on Harmonic mean survival time (10^2/t) (p=<0.01). Multiple treatments with carboxymethylcellulose-polylysine-complexed poly(I).poly(C) significantly increased protection against encephalomyocarditis virus in mice compared to a single treatment.