inclusion criteria: * health personnel who are or have been in contact with patients with disease due to sars-cov-2 infection within the last 14 days before randomization. * negative result for test against covid-19. * subjects who have given informed consent. * men or women aged between 18 and 65 years, both included. * subjects who have a smartphone where they can load an app for monitoring the symptoms.

inclusion criteria: * health personnel who are or have been in contact with patients with disease due to sars-cov-2 infection within the last 14 days before randomization. * negative result for test against covid-19. * subjects who have given informed consent. * men or women aged between 18 and 65 years, both included. * subjects who have a smartphone where they can load an app for monitoring the symptoms.

inclusion criteria: - health personnel who are or have been in contact with patients with disease due to sars-cov-2 infection within the last 14 days before randomization. - negative result for test against covid-19. - subjects who have given informed consent. - men or women aged between 18 and 65 years, both included. - subjects who have a smartphone where they can load an app for monitoring the symptoms.

inclusion criteria: - health personnel who are or have been in contact with patients with disease due to sars-cov-2 infection within the last 14 days before randomization. - negative result for test against covid-19. - subjects who have given informed consent. - men or women aged between 18 and 65 years, both included. - subjects who have a smartphone where they can load an app for monitoring the symptoms.