inclusion criteria: - man or woman over 18 and under 60 years old - physicians or nurses or nurse assitant who work in areas of care for patients with covid-19 (emergency, hospitalization, and intensive care unit) in hospitals in lima, peru. - healthy participants, without covid-19 suggestive symptoms - participant who wants to participate and signs the informed consent.

inclusion criteria: - man or woman over 18 and under 60 years old - physicians or nurses or nurse assitant who work in areas of care for patients with covid-19 (emergency, hospitalization, and intensive care unit) in hospitals in lima, peru. - healthy participants, without covid-19 suggestive symptoms - participant who wants to participate and signs the informed consent.