Table 3.

Geometric mean ratio of interferon-gamma level (mIU/mL) at 2-week after ChAdOx1/AZD1222 vaccination among participants who previously received two doses of CoronaVac.

Group	No. of Participants	Geometric Mean Concentration (95% CI)	Geometric Mean Ratio (95% CI)
IM	41	1771.88 (1307.90–2400.47)	Ref.
ID1	40	2373.49 (1687.73–3337.88)	1.34 (0.86–2.20)
ID2	43	2805.13 (2100.97–3745.31)	1.58 (1.05–2.39)

IM: intramuscular standard dose. ID1: 20% intradermal fractional dose. ID2: 20% intradermal fractional dose.