Clinical and immunological efficacy of intranasal interferon in the post-vaccination period in patients vaccinated against SARS-CoV-2 coronavirus

The COVID-19 pandemic, caused by SARS-CoV-2, remains one of the actual medico-social issues of today's world. Novel coronavirus infection officially listed in dangerous infections. When an ingress of coronavirus infection in the background of intensive production of inflammatory inducers comes with decreased levels of type I interferon that cause loss of protective abilities of the body against the background of the destruction of its own tissues. Herd immunity development via vaccination increases the proportion of people with protective immunity against SARS-CoV-2 is an important factor in stopping the spread of the infection. However, during the first days after vaccination, patients remain susceptible to possible infection. A promising prophylactic agent is interferon-containing drugs widely used in Russia and CIS countries for the prevention and treatment of viral infectious diseases, in particular SARS and influenza. Our study showed that intranasal recombinant IFN-2b has clinical and immunological efficacy after two courses of the drug (within 5 days after V1 and after V2 vaccination with the EpiVacCorona vaccine).