The main problem in creating anti-coronavirus vaccines that target mainly proteins of the outer membrane of the virus is the rapid variability in the RNA genome of the pathogen that encodes these proteins. In addition, the introduction of technologies that can affordably and quickly produce flexible vaccine formulas that easily adapt to the emergence of new subtypes of SARS-CoV-2 is required. Universal adjuvant oligonucleotide vaccines based on conserved regions of the SARS-CoV-2 genome can take into account the dynamics of rapid changes in the virus genome, as well as be easily synthesized on automatic DNA synthesizers in large quantities in a short time. In this brief report, the effectiveness of four phosphorothioate constructs of the La-S-so-type adjuvant oligonucleotide vaccine is evaluated on B6.Cg-Tg (K18-ACE2)2 transgenic mice for the first time. In our primary trials, the oligonucleotide vaccine increased the survival rate of animals infected with SARS-CoV-2 and also reduced the destructive effects of the virus on the lung tissue of mice, activating both their innate and adaptive immunity. The obtained results show that the development of adjuvant oligonucleotide vaccine constructs of the La-S-so type is an affordable and efficient platform for the prevention of coronavirus infections, including those caused by SARS-CoV-2.

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