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. 2022 May 13;7:52. doi: 10.1038/s41541-022-00475-z

Fig. 1. CONSORT chart of study design and volunteer recruitment.

Fig. 1

Healthy volunteers who had been vaccinated with two doses of CoronaVac were recruited into the study. 94 participants were enrolled and randomised into 3 study groups. Group 1 participants were received a full dose of ChAdOx1 nCoV-19 intramuscularly. Group 2 and Group 3 volunteers were vaccinated intradermally with a fractional dose of the viral vector vaccine. The interval between completed primary series of CoronaVac and the booster was 4–8 weeks in Group 1 and 2 but was > 8–12 weeks in Group 3. ID intradermal, IM intramuscular.