Table 1.

Characteristics of XBB cases by vaccination history and clinical outcomes.

Vaccination history	Non-hospitalised	Non-severe hospitalised	Severe hospitalised
XBB.1.16 (n = 1210) Detected from 15 Feb, 2023
Primary series with booster <1 year	374	122	63
Primary series with booster ≥1 year	244	85	49
At most primary series	158	89	26
Total	776 (64%)	296 (25%)	138 (11%)
XBB.1.5 (n = 1088) Detected from 5 Dec, 2022
Primary series with booster <1 year	316	144	49
Primary series with booster ≥1 year	250	94	38
At most primary series	95	84	18
Total	661 (61%)	322 (29%)	105 (10%)
XBB.1.9 (n = 1332) Detected from 6 Jan, 2023
Primary series with booster <1 year	370	171	53
Primary series with booster ≥1 year	305	130	43
At most primary series	116	116	28
Total	791 (60%)	417 (31%)	124 (9%)
XBB.2.3 (n = 1305) Detected from 20 Feb, 2023
Primary series with booster <1 year	395	158	62
Primary series with booster ≥1 year	253	118	58
At most primary series	133	99	29
Total	781 (60%)	375 (29%)	149 (11%)
Other XBB (n = 975) Detected from 6 Sep, 2023
Primary series with booster <1 year	296	135	37
Primary series with booster ≥1 year	187	99	28
At most primary series	113	73	7
Total	596 (61%)	307 (32%)	72 (7%)