inclusion criteria: - adult participant (>18 years) - hcw who had a contact without adequate personal protective equipment (ppe) with a confirmed covid-19 patient. - time between exposure to randomization no longer than 72 hours. - informed consent from participant

inclusion criteria: - adult participant (>18 years) - hcw who had a contact without adequate personal protective equipment (ppe) with a confirmed covid-19 patient. - time between exposure to randomization no longer than 72 hours. - informed consent from participant