Fig. 1: Study profile.

IM Ad5-nCoV adenovirus type 5 vectored COVID-19 vaccine through intramuscular injection, IH Ad5-nCoV adenovirus type 5 vectored COVID-19 vaccine through oral inhalation.
IM Ad5-nCoV adenovirus type 5 vectored COVID-19 vaccine through intramuscular injection, IH Ad5-nCoV adenovirus type 5 vectored COVID-19 vaccine through oral inhalation.