People who have received one or two injections of the Covid-19 vaccine may wonder if they can still infect another person. According to American researchers from the CDC (Centers for disease control and prevention), the risk of infection is considerably reduced for people who have been vaccinated.
MRNA vaccines are protective
Scientists conducted their study from December 14, 2020 to March 13, 2021. It concerns several US states and includes nearly 4,000 participants. Among them, health professionals and staff or in direct contact with the population, who have never contracted Covid-19. A group of 2,479 people received the two doses of RNA vaccine (Pfizer or Moderna), nearly 480 people received a single dose and the rest were not vaccinated. Each week, volunteers were asked to perform an RT-PCR test whether or not they showed symptoms of the disease. As initially expected, RNA vaccines are able to protect severe forms of Covid-19. In contrast, in the group of people vaccinated, there was 0.04 infection per 1000 person-days (unit of measurement) after 15 days and 0.19 infection two weeks after the first dose inoculated. Regarding the group that did not receive a vaccine, the CDC identifies 1.38 infections per 1,000 person-days.
In summary, the risk of infection after receiving two doses is reduced by 90%. In addition, from the first dose received, the risk of being contaminated is reduced by 80%, two weeks after the injection. CDC Director Rochelle Walensky says: “ vaccinated people do not carry the virus (and) do not get sick “.
These data are potentially great news, as it means that the spread of the coronavirus by asymptomatic people can be significantly limited. RNA vaccines therefore protect serious forms, but also prevent infections.
