time to clinical improvement or discharge from hospital assessed using medical records;incidence of death and/or need for invasive or non-invasive ventilation. assessed using medical records;Incidence of COVID-19 in cancer patients using interferon-alpha as prophylaxis without known positive contact with COVID-19 (COVID-19 confirmed by qPCR from respiratory swab);incidence of any upper or lower community acquired respiratory viral infection assessed using local standard of care testing;incidence of any upper or lower community acquired respiratory viral infection assessed using local standard of care testing;incidence of COVID-19 when Interferon alpha is given as post-exposure prophylaxis with a known positive contact or exposure with COVID-19. COVID-19 confirmed by qPCR from respiratory swab .

time to clinical improvement or discharge from hospital assessed using medical records;incidence of death and/or need for invasive or non-invasive ventilation. assessed using medical records;Incidence of COVID-19 in cancer patients using interferon-alpha as prophylaxis without known positive contact with COVID-19 (COVID-19 confirmed by qPCR from respiratory swab);incidence of any upper or lower community acquired respiratory viral infection assessed using local standard of care testing;incidence of any upper or lower community acquired respiratory viral infection assessed using local standard of care testing;incidence of COVID-19 when Interferon alpha is given as post-exposure prophylaxis with a known positive contact or exposure with COVID-19. COVID-19 confirmed by qPCR from respiratory swab .