Table 3.
Details of secondary cases resulting from COVID-19 transmission in seven NSW educational settings where enhanced surveillance of symptomatic and asymptomatic close contacts was done
|
Symptomatic (n=65) |
Asymptomatic (n=223) |
Symptoms unknown (n=352)* |
Total secondary cases | Percentage of contacts tested | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n | NAT | Serology | Any test | n | NAT | Serology | Any test | n | NAT* | Serology | Any test | ||||
| Child contacts | |||||||||||||||
| SS 2 | 20 | 0/19 | 1/16 (6%) | 1/20 (5%) | 90 | 0/51 | 0/52 | 0/74 | 83 | 0/47 | 0/3 | 0/47 | 1 | 73% | |
| SS 6 | 4 | 0/4 | 0/3 | 0/4 | 43 | 0/5 | 1/36 (3%) | 1/36 (3%)† | 18 | 0/4 | 0/4 | 0/6 | 1 | 70% | |
| PS 1 | 2 | 1/2 (50%) | 1/2 (50%) | 1/2 (50%) | 18 | 0/18 | 0/13 | 0/18 | 46 | 0/8 | 0/1 | 0/8 | 1 | 42% | |
| PS 2 | 1 | 0/1 | 0/1 | 0/1 | 8 | 0/1 | 0/6 | 0/6 | 34 | 0/4 | 0/8 | 0/12 | 0 | 44% | |
| ECEC 1 | 0 | 0/0 | 0/0 | 0/0 | 0 | 0/0 | 0/0 | 0/0 | 16 | 0/16 | 0/5 | 0/16 | 0 | 100% | |
| ECEC 3 | 21 | 0/18 | 0/4 | 0/20 | 22 | 0/6 | 0/7 | 0/11 | 108 | 0/55 | 0/4 | 0/59 | 0 | 60% | |
| ECEC 6 | 7 | 3/6 (50%) | 3/6 (50%) | 4/7 (57%) | 13 | 3/13 (23%) | 2/8 (25%) | 3/13 (23%) | 5 | 0/4 | 0/2 | 0/4 | 7 | 96% | |
| All | 55 | 4/50 (8%) | 5/32 (16%) | 6/54 (11·%) | 194 | 3/94 (3%) | 3/122 (3%) | 4/158 (3%) | 310 | 0/138 | 0/27 | 0/152 | 10 | 65% | |
| Adult contacts | |||||||||||||||
| SS 2 | 1 | 0/1 | 0/0 | 0/1 | 8 | 0/4 | 0/3 | 0/5 | 9 | 0/7 | 0/2 | 0/7 | 0 | 72% | |
| SS 6 | 0 | 0/0 | 0/0 | 0/0 | 7 | 0/1 | 1/5 (20%) | 1/5 (20%) | 2 | 0/1 | 0/1 | 0/1 | 1 | 67% | |
| PS 1 | 1 | 1/1 (100%) | 0/0 | 1/1 (100%) | 5 | 0/3 | 0/4 | 0/5 | 9 | 0/4 | 0/1 | 0/4 | 1 | 67% | |
| PS 2 | 0 | 0/0 | 0/0 | 0/0 | 0 | 0/0 | 0/0 | 0/0 | 2 | 0/1 | 0/2 | 0/2 | 0 | 100% | |
| ECEC 1 | 0 | 0/0 | 0/0 | 0/0 | 0 | 0/0 | 0/0 | 0/0 | 0 | 0/0 | 0/0 | 0/0 | 0 | 100% | |
| ECEC 3 | 2 | 0/2 | 0/1 | 0/2 | 4 | 0/1 | 0/1 | 0/1 | 19 | 0/16 | 0/2 | 0/17 | 0 | 80% | |
| ECEC 6 | 6 | 6/6 (100%) | 2/2 (100%) | 6/6 (100%) | 5 | 0/4 | 0/2 | 0/4 | 1 | 0/1 | 0/1 | 0/1 | 6 | 92% | |
| All | 10 | 7/10 (70%) | 2/3 (67%) | 7/10 (70%) | 29 | 0/13 | 1/15 (7%) | 1/20 (5%) | 42 | 0/30 | 0/9 | 0/32 | 8 | 77% | |
| Total | 65 | 11/60 (18%) | 7/35 (20%) | 13/64 (20%) | 223 | 3/107 (3%) | 4/137 (3%) | 5/178 (3%) | 352 | 0/168 | 0/36 | 0/184 | 18 | 67% | |
Data are n/N (% positive of those contacts tested), unless otherwise stated. NAT=nucleic acid test. SS=secondary school. PS=primary school. ECEC=early childhood education and care setting. NSW=New South Wales.
*
55% of all contacts did not complete a detailed symptom questionnaire and other data on symptoms at time of testing could not be obtained.
†
Asymptomatic in post-exposure period but reported influenza-like illness in period before primary case onset.