Immunity to the coronavirus that causes Covid-19 can last for atleast six months, as revealed in earlier research. It can last longer as well even years when all the components body’s immune memory are considered.
According to the report, the pre-print paper, posted on Monday to the online server biorxiv.org, adds to the body of research on immunity to the novel coronavirus. Several studies have focused on antibodies, or protein components of the immune system, and some suggested immunity could wane over just a few months.
However, the new study, which has not been peer-reviewed or published in a scientific journal, involves analyzing multiple compartments of immune memory over time: antibodies, B cells and T cells, among other features of immune memory.
The study included 185 adults, ages 19 to 81, in the United States who had recovered from Covid-19. Most of the adults had mild disease.
The researchers from the La Jolla Institute for Immunology, University of California, San Diego, and Icahn School of Medicine at Mount Sinai examined blood samples collected at various points following the onset of symptoms, with some collected more than six months later.
In the blood samples, the researchers examined components of immune memory. They found that antibodies “were durable” with only “modest declines” occurring at six to eight months, however observed that there was about a 200-fold range in the level of antibody responses among the adults.