Fig. 8

Principal Component Analysis (PCA) following Omicron infection in all four groups based on all immune parameters obtained at Day 0 (a) and Day 30 (b). Arrows indicate the prominent immunological parameters. Ellipses represent the clustering of each group. Blue indicates previously exposed-vaccinated (SP + V), red indicates unexposed-vaccinated (SN + V), black indicates Secondary Omicron infection (SP + UNV), and pink indicates Primary Omicron infection (SN + UNV). W- WT, D- Delta, Om- Omicron.