Fig. 2.

Spline-based VE of two-dose primary-series AZD1222 vaccination against hospitalisation due to COVID-19 in SARI patients, by time since last dose of AZD1222. The grey shaded area corresponds to the truncated 95% CI, and the tick-marks on the x-axis indicate the symptom onset dates (in relation to the date of the last vaccine dose) of the SARI patients included in the analysis. The rugs at the bottom of the plot have a small amount of noise (up to ±3 weeks) added to the actual values. CI = confidence interval. SARI = severe acute respiratory infection. VE = vaccine effectiveness.