According to the research, which included 306 healthcare subjects, the estimated mean time to total loss of neutralizing antibodies was 375 days, declining in 82 percent of subjects and remaining stable in 13.1 percent.
‘During the study, carried out with different cohorts and in different periods, two types of response were observed: one more frequent, with progressive loss of the antibody title; and another, less usual, of subjects who maintained a stable level of antibodies’, points out José Varona, principal scientist of the study.
Regarding this stability, the publication also states some related variables, such as advanced age, over 45 years of age, previous possession of high antibody levels, the presence of symptoms during the disease and a greater degree of exposure to active patients with Covid-19.
This is the first study to measure over a long period of time the immune response of populations vulnerable to the pandemic, according to the scientific journal’s website.
‘We expect new research results with a longer term, specifically, with data extending to the second half of 2021, which will help us to better and more accurately understand the immune response to this virus,’ Varona pointed out.