Validation of Laboratory Techniques, Strategies, and Types of Samples for Epidemiological Control in the Covid-19 Pandemic

Inclusion criteria: * Symptomatic: Subjects with signs and symptoms of respiratory infection less than or equal to 3 days, preferably with clinical and molecular diagnosis compatible with Covid-19. * Asymptomatics: Subjects who have had direct contact with people infected and who have not shown any symptoms related to Covid-19. * Negative: Individuals with negative RT-PCR testing for SARS-CoV-2 (reference test) who have not manifested any symptoms seven days prior to sampling. Exclusion criteria: * Adults under the age of 21 or over 65 * Subjects with a clinical history of autoimmune disease or chemotherapy treatments. * Subjects who have received transfusions or convalescent plasma in the last month prior to enrollment. * Subjects with prior diagnosis of other infectious diseases such as, but not limited to AIDS, Hepatitis B or C, Tuberculosis, or any other ongoing or unresolved diseases. * Subjects with malformation or oncological pathology of the upper respiratory track that may hinder sample collection, including but not limited to deviated septum, allergic rhinitis. * Subjects who have not signed or can not sign the informed consent form * Subjects not able to provide their complete information or access to their clinical history.