Characteristic | Total | Source case identified by CE | OR (95% CI) | |
Yes | No | |||
Cases | 176 | 111 (63) | 65 (37) | |
Age years | ||||
<5 | 78 | 54 (69) | 24 (31) | 1.0 |
5–14 | 98 | 57 (58) | 41 (42) | 1.62 (0.87–3.03) |
Sex | ||||
Female | 100 | 59 (59) | 41 (41) | 1.0 |
Male | 76 | 52 (68) | 24 (32) | 0.66 (0.35–1.24) |
Population group | ||||
CBO | 61 | 43 (71) | 18 (30) | 1.0 |
RFN | 56 | 53 (95) | 3 (5) | 0.14 (0.04–0.50) |
FB | 59 | 15 (25) | 44 (75) | 7.01 (3.14–15.66) |
Method of detection | ||||
Contact tracing | 108 | 107 (99) | 1 (1)# | |
Symptoms | 59 | 4 (4)¶ | 55 (97) | |
Other screening+ | 9 | 0 (0) | 9 (100) |
Data is presented as n or n (%), unless otherwise stated. CBO: Canadian-born “other”; RFN: registered First Nations; FB: foreign born; OR: odds ratio. #: this child was a close contact of a relative who lived in a neighbouring province-there was no source case in Alberta; ¶: four children were index cases with symptoms and their source cases were identified through reverse contact tracing; +: other screening includes immigration medical evaluations, international adoptee screening and incidental findings.