Antibodies are one of the most important components of the immune system against infections. So far, little is known about the contribution of antibodies in the protection against the SARS-CoV-2. Measuring antibody levels in the population will allow to determine who has been infected; this could also be useful to know if people with certain levels of antibodies are already protected against the disease.Copyright: © 2020 Revista Medica del Instituto Mexicano del Seguro Social.