inclusion criteria: - be part of the health personnel (intensivist doctor, hospital doctors, nurses, physical therapists and support staff in the care unit) who will work at the hun in the period of may 1st, 2020 to august 1, 2020 - be over 18 years old, exposed to patients with covid-19. not having symptoms compatible with an acute respiratory infection for the last 21 days. - willingness to donate blood samples and for diagnosis and monitoring of sars-cov-2 infection throughout the study period. - have a smart phone in order to facilitate permanent communication with you during the duration of the study. - signature of informed consent.

inclusion criteria: - be part of the health personnel (intensivist doctor, hospital doctors, nurses, physical therapists and support staff in the care unit) who will work at the hun in the period of may 1st, 2020 to august 1, 2020 - be over 18 years old, exposed to patients with covid-19. not having symptoms compatible with an acute respiratory infection for the last 21 days. - willingness to donate blood samples and for diagnosis and monitoring of sars-cov-2 infection throughout the study period. - have a smart phone in order to facilitate permanent communication with you during the duration of the study. - signature of informed consent.