Blood tests in centralized isolation during neocoronavirus infection are drawn to detect the presence of IgM (serum immunoglobulin M) or IgG (serum immunoglobulin G) antibodies, or to routinely test for the relevant indicators in the case of infected persons. If blood is drawn in centralized isolation during a new coronavirus infection, the general purpose is to test for the presence of IgM or IgG antibodies, where IgG needs to be formed after a longer period of infection, with reference to the occurrence of previous infections, and IgM is usually formed after the occurrence of an infection in the last 3 months. For asymptomatic or mildly infected patients, the main purpose of blood sampling during centralized isolation is to test relevant indicators, such as blood routine, coagulation function, liver function, etc., and to observe whether there is any exacerbation of the disease in infected patients. Therefore, there is no need to worry and it is sufficient to actively cooperate with the medical staff.