The genetic variation is based on the lack in the immune system of a receptor that is lacking about 4% of the population. The research produced a conclusion statement that people with a partial or total absence of the NKG2C receptor tend to develop severe courses of Covid-19. This genetic variation was found especially in people infected by the Coronavirus who had to be hospitalized and The absence of the receptors especially common in patients who had to be treated for Covid-19 in Intensive Care Units, regardless of age or sex. How effective is the vaccine considering all these variations in Genetic makeups?

