A new study published in the journal Nature by researchers at Mount Sinai in collaboration with two other labs at Rockefeller University and co-investigators from the California Institute of Technology and Weill Cornell Medicine describes for the first time a persistence of SARS-CoV-2 in the intestines long after clinical resolution.
The study, entitled “Evolution of antibody immunity to SARS-Cov-2” and published online January 18, 2021, suggests that the memory B cell response to SARS-Cov-2 evolves between 1.3 and 6.2 months after infection in a manner that is consistent with antigen persistence.
Saurabh Mehandru, MD
The authors studied intestinal biopsies obtained from asymptomatic individuals four months after the onset of COVID-19.
Minami Tokuyama, a medical student at the Icahn School of Medicine at Mount Sinai, and other members of the Mehandru Lab at the School of Medicine discovered that SARS-CoV-2 antigens persisted in the lining cells (epithelium) of the intestines long after (3-4 months post infection) resolution of clinical symptoms. The presence of such sanctuary sites could potentially enable continued maturation of the antibody response as was independently discovered by the Nussenzweig Lab at Rockefeller University.
“This finding is significant because it suggests that the memory B cell response does not wane after six months, providing reassurance that those who have previously been infected with the virus will likely mount a vigorous response if they are exposed a second time,” says study author Saurabh Mehandru, MD, Associate Professor of Gastroenterology at the Icahn School of Medicine and Director of the Mehandru Lab.
“Additionally, the presence of viral sanctuaries within the body needs to be better understood in COVID-19 patients with chronic symptoms, or ‘long haulers,’ which could help in identifying novel opportunities for the treatment of this group of patients,” says Dr. Mehandru.