According to the deputy director for scientific work of the St. Petersburg Research Institute of Epidemiology and Microbiology named after Pasteur Vladimir Dedkov, for this it is enough to be vaccinated against coronavirus.
This decrease in the number of severe cases of COVID-19 just the effect of vaccination. The vaccine may not fully protect, but nevertheless, when a person becomes infected, his disease progresses more easily. Vladimir Dedkov
The specialist notes that vaccination cannot guarantee 100% effectiveness of protection against COVID-19. But at the same time, it is the vaccine that is the best way to avoid the need for artificial lung ventilation (ALV) in case of infection.