. 2022 Mar 12;75(1):e572–e578. doi: 10.1093/cid/ciac212

Table 2.

Geometric Mean Concentration of Anti-SARS-CoV-2 Spike IgG Antibodies Among Healthcare Workers in the 11 months Following Vaccination Against COVID-19, Israel, December 2020 to October 2021

	Total Number  in Category	T1			T 2			T3			T4			T5			T6
Group		n	GMC	CI	n	GMC	CI	n	GMC	CI	n	GMC	CI	n	GMC	CI	N	GMC	CI
Previously infected, received booster^b	18	35	876.6	566.4–1356.7	28	583.9	411–829.4	25	471	331.2–670	21	268.4	185.6–388.2	4	121.5	41.8–353.1	7^a	2016.3	1010.1–4024.7
Previously infected, not boosted^b	100	35	876.6	566.4–1356.7	28	583.9	411–829.4	25	471	331.2–670	21	268.4	185.6–388.2	4	121.5	41.8–353.1	2	120..9	22.6–646.4
Infected between tests 4 and 5 (not boosted)	22	12	64.1	43.8–93.6	14	246..6	176.1–345.5	11	305.1	189.1–492.3	11	184.4	115.4–294.5	17	2704.3	1353.5–5403.3	11	3699.9	2759.6–4960.6
Infected between tests 5 and 6 (not boosted)	17	10	44.8	25.6–78.4	11	205.2	170.2–247.4	15	209.4	161.4–271.5	12	128.2	86.4–190.3	10	165.1	65.9–414	8	6805.3	3791.1–12215.7
Never infected, fully  vaccinated (3 doses)^b	740	500	63.9	60.3–67.9	529	197.3	189.9–205.1	526	223.4	211.1–236.5	506	139.1	130.4–148.4	419	114.9	106.6–123.9	302^a	2618.4	2411.4–2843
Never infected, 2 doses  (no booster)^b	116	500	63.9	60.3–67.9	529	197.3	189.9–205.1	526	223.4	211.1–236.5	506	139.1	130.4–148.4	419	114.9	106.6–123.9	5	150.9	25.6–890.4
<35, never infected, fully vaccinated (3 doses)	167	112	79.7	70.3–90.2	110	243.1	219–269.9	96	288.3	253.8–327.5	96	177.8	158.3–199.6	76	132.8	117.1–150.6	46^a	3208.2	2689–3827.7
35–44 never infected, fully vaccinated (3 doses)	186	130	66.7	60–74.3	133	202.4	185.8–220.5	127	216.3	195.5–239.3	118	131.8	115.9–149.7	107	113.7	101.9–126.9	76^a	2079.3	1768.2–2445.3
45–54 never infected, fully vaccinated (3 doses)	185	119	63.5	56.7–71	135	196.3	185.1–208.1	147	225.3	202.4–250.7	130	146.3	129.2–165.5	129	118	103.3–136.6	84^a	2605.7	2252.2–3014.7
≥55+ never infected, fully vaccinated (3 doses)	204	130	51.8	45.5–59.1	142	165.3	156.5–174.7	146	192.1	170.6–216.2	153	118.7	103.7–135.8	96	98.7	79.4–122.7	91^a	2806.2	2370.4–3322.4
35–54 never infected, Jewish fully vaccinated (3 doses)	228	189	64.9	59–71.3	205	197.6	187.5–208.2	216	217.4	199.3–237.1	194	144.9	131.1–160.2	199	122.3	108.9–137.4	122^a	2409.2	2146.6–2703.9
35–54 never infected, Arab (incl Druze) fully vaccinated (3 doses)	234	179	68.2	61–76.2	214	201.3	188.6–214.9	218	234.5	214.7–256.2	194	149.9	134.3–167.2	195	134.3	118.6–152.1	117^a	2640.3	2313–3013.8

Abbreviations: CI, confidence interval; COVID-19, coronavirus disease 2019; GMC, geometric mean concentration; IgG, immunoglobulin G; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.

Indicates groups and timepoints where IgG levels were measured post boosting.

Where groups are similar except for boosting, timepoints prior to the booster are reported together.