Table 8.

Normalized saliva anti-spike IgG and IgA levels.

	n IgG+	Normalized IgG Level	n IgA+	Normalized IgA Level
Vaccinated HU (n = 15)	5	1.3 (0.7–1.6)	5	1.3 (1.1–2.9)
Vaccinated HIV (n = 19)	2	0.7 (0.5–0.9)	5	0.3 (0.2–2.2)
COVID HU (n = 8)	0	/	5	1.1 (0.6–1.6)
COVID HIV (n = 13)	1	0.2 (0.2–0.2)	9	1.0 (0.7–1.6)

Medians with IQRs in brackets are presented for the spike-specific IgA and IgG levels given as ratios obtained by dividing the extinction of the sample by that of the calibrator and normalizing it to the protein concentration (µg/µL) in saliva. Only values of subjects that had saliva Ig ratios above the cut-off before normalization are shown. HU: HIV-1-uninfected. A ratio of <0.8 was considered as negative, a ratio of 0.8–1.1 as borderline and ≥1.1 as positive. No significant differences as tested by Mann-Whitney U tests.