From many quarters it is observed that worldwide the number of people who have overcome Covid-19 or who have been completely immunized is not yet very high.
It still seems to be too early to think of absolute normality for the “open bar”. Several studies have found infections between 10% and less than 1% of people already immunized. Small percentages but in any case not to be underestimated.
These people, asymptomatic in most cases thanks to natural or vaccine-induced immunity, still retain the ability to spread the Coronavirus for some time, even if they do not develop the disease.
What is certain is that we are in a race against the virus where the key to avoiding the danger of contagion is to achieve the widest possible group immunity in the shortest period of time.
Jocelyn Keehner and Lucy E. Horton, along with other members of the University of California (UCLA) and San Diego (UCSD) Schools of Medicine, published the results of a study in the New England Journal of Medicine (NEJM) last March. internal investigation which found the absolute risk of testing positive for Coronavirus after vaccination it was 1.19% among UCSD health professionals and 0.97% among UCLA health professionals.
These data were also confirmed by another study by the Centers for Disease Control and Prevention in the United States and other previous ones reported in Nature and the British Medical Journal.
It is very likely that there are more cases of reinfection than those detected, since, in most cases, they do not produce symptoms and, therefore, people do not undergo control.
It is therefore absolutely important to maintain common safety measures until vaccination is general. Until herd immunity is achieved the mutations that give the virus greater infectivity will have a greater ability to spread to more people.
Fast-spreading variants of the Coronavirus carry mutations that allow it to escape part of the immune response created naturally or through vaccination, confirms a new study published in Science by scientists from the United States, Germany and the Netherlands.
The researchers focused on three mutations: K417N, E484K and N501Y. They are found in most major SARS-CoV-2 variants and affect what is the gateway of the virus to the human cell.The importance of mass vaccination, which includes all age groups, is also supported by the Mount Sinai School of Medicine (USA) neurologist Seth M. Glickenhaus, lead author of a study on reinfection in young people “Our results indicate that reinfection with SARS-CoV-2 occurs in young adults. Despite a previous infection, the young people can contract the virus again and can still pass it on to others.This is an important point to remember as you continue to vaccinate.
Despite a previous infection, young people can contract the virus again and pass it on to others.
The study indicates that antibodies induced by SARS-CoV-2 infection are largely protective, but do not fully protect against reinfection in young people.
The study tracked more than 3,249 members of the United States Marine Corps between May and November 2020. About 10 percent of participants who had previously had the disease were reinfected. Research determined that those without immunity had five times the risk of infection than participants with antibodies, but the latter still had some risk of reinfection.