Study protocol for Safety,immunogenicity and protection of heterologous boost with an aerosolised Ad5-nCoV after two-dose inactivated COVID-19 vaccines in adults:a multicentre,open-label phase 3 trial
A CLINICAL TRIAL OF HETEROLOGOUS BOOSTER IMMUNIZATION WITH RECOMBINANT COVID-19 VACCINE (ADENOVIRUS TYPE 5 VECTOR) FOR INHALATION AFTER PRIMARY SERIES OF INACTIVATED COVID-19 VACCINE