As more people get vaccinated against Covid-19 and acquire immunity, those without immunity against coronavirus reduce their risk of become infected and, therefore of hospitalization.
It has been seen by an investigation carried out in Sweden on more than a million and a half people, some 800,000 families, by researchers from the
“The results confirm that vaccination is important not only for individual protection, but also to reduce the transmission, especially within families, what is a high risk environment for transmission‘Says Peter Nordström, the research coordinator.
Vaccines reduce the risk of Covid-19. Many studies have shown its great
impact on the pandemic; however, there is less data on the influence of vaccination on virus transmission in high-risk environments, as it is between members of the same family.
In this study, the researchers found that there was a dose-response relationship between the number of immune individuals in each family and the risk of infection and hospitalization in non-immune family members.
Specific, the risk of infection and hospitalization among non-immune family members ranged from a 45 and 97% as the number of vaccinated family members increased.
The study is based on the records of more than 1.8 million people of over 800,000 families. The researchers combined data from three Swedish national registries and quantified the association between the number of family members with immunity to Covid-19 and the risk of infection and hospitalization in non-immune people.
The researchers took into account differences in age, socioeconomic status, the type of families and those previously identified as risk factors for Covid-19.
The data, he points out Marcel Ballin, co-author of the study show that «vaccination helps not only to reduce the risk of infection of the individual, but also to decrease transmission, what to your instead minimizes not only the risk that more people will become seriously ill, but also that new variants will emerge.
Therefore, the researchers conclude, ensure vaccination in as many people as possible has implications locally, nationally and globally.