Table 4.

Mean antibody titer by age category and immune status, limited to those seropositive, Chandigarh, India, 2017–2018.

	Age (in years)
	1–5	6–10	11–15	16–20	21–30	31–40	41–50	51–60
Overall	85.53	116.28	112.86	115.46	119.78	121.61	119.90	120.25
V- NH+	156.71	176.31	191.03	159.20	154.25	121.73	93.54	141.06
V+ NH+	118.87	107.59	110.91	94.30	139.97	140.69	N/A	167.63
1 V NH-	77.58	102.97	100.71	116.51	114.22	137.05	66.89	N/A
2 V NH-	79.42	184.74	26.16	N/A	N/A	N/A	N/A	N/A
Unknown	38.34	169.55	141.15	113.73	116.52	121.17	124.68	118.81

NH = Natural History, V = Vaccination (any number of doses), 1 V = 1 dose of vaccine, 2 V = 2 doses of vaccine