TABLE 1.

Neutralization activities of convalescent-phase sera against the Omicron variant^a

No. of samples	Age range (yr)	Time after symptom onset	Neutralization titer		Fold reduction (WT/Omicron)	Reference
			WT	Omicron
24	NA	1 yr	NA	NA	10.1	44
28	NA	1–3 mo	ED50 = 556	ED50 = 66	8.4	45
30	20–72	143–196 days	GMT = 85.7	GMT = 8.1	10.6	46
10	45–79	9–120 days	IC50 = 4344	IC50 < 135	>32	47
17	25–78	14–28 days	NA	23% samples above LOD	NA	48
12	34–73	14–28 days (hospitalized)	NA	75% samples above LOD	37	48
16	32–77	6 mo	ED50 = 569	36% samples above LOD	NA	49
22	23–82	12 mo	ED50 = 580	39% samples above LOD	NA	49
15	NA	23–87 days	NA	27% samples above LOD	>11.1	50

^aLOD, limit of detection; NA, not applicable.