Infection with omicron is usually detectable 3 to 5 days after infection, and may take about 14 days in some infected persons. Omicron is a mutated strain of the currently prevalent Neocoronavirus, and the incubation period is significantly shorter than that of earlier Neocoronaviruses, averaging around 3 to 5 days. Therefore, most people infected with Omicron can be detected after 3 to 5 days, i.e., a positive nucleic acid test result. However, there are some special infected patients with relatively long incubation period, theoretically up to 14 days, which is also the basis for the formulation of relevant epidemic prevention policies. These infected patients are usually relatively invisible, do not show symptoms of infection or have mild symptoms, and only show positive results in the nucleic acid test. The specific situation varies from patient to patient, and further judgment is required after consulting with a medical professional.