Table 2. Characteristics of confirmed SARS-COV-2 reinfection cases as reported in observational studies analysed.
| Author | Preprint | Country and Setting | Total | Reinfection cases | Age in years | Re-positive rate (%) | Time in weeks between 1st and 2nd episode | Symptomatic at reinfection (%) | Onward transmission from 2nd episode |
|---|---|---|---|---|---|---|---|---|---|
| Hanrath AT et al. [67] | No | UK, healthcare workers | 1038 | 0 | NR | 0.00% | 24 | NA | NR |
| Abu-Raddad LJA et al. [63] | Yes | Qatar, surveillance | 133266 | 54 | median 33 range (16–57) |
0.04% | median 9.3 (6.4–18.4) | 42.6% | NR |
| Pilz et al. [25] | No | Austria, surveillance | 14840 | 40 | median 39.8 range (26–55) |
0.27% | 30±4 | 7.5% hospitalisation | NR |
| Lumley SF et al. [62] | Yes | UK, healthcare workers | 1246 | 4 | NR | 0.32% | 22.8–33 | 25.0% | NR |
| Patwardhan A [68] | No | USA, children | 989 | 4 | median 3.55 range (0.2–13) |
0.40% | 1–3 after last negative | 50.0% | NR |
| Hansen CH et al. [26] | No | Denmark, surveillance | 11068 | 72 | NR | 0.65% | >12 | NR | NR |
| Luo S et al. [81] | No | China, hospital patients | 1673 | 13 | NR | 0.78% | NR | 100% | NR |
| Pan L et al. [73] | No | China, hospital patients | 1350 | 14 | 44.4 ± 15 | 1.04% | 1.7 ± 0.7 after discharge | 7.1% | not found |
| Kang YJ et al. [82] | No | South Korea | 7829 | 163 | in groups | 2.08% | >1–5 after discharge | 43.9% mild | NR |
| Du HW et al. [74] | No | China, hospital patients | 126 | 3 | NR | 2.38% | 1–3 after treatment | >66.7% | not found |
| Ali AM et al. [61] | Yes | Iraq, hospital patients | 829 | 26 | range 10–60 | 3.14% | 3.7–19.7 after recovery | 96.2% | NR |
| Wang X et al. [83] | No | China, hospital patients | 193 | 12 | 55.5 ±13.7 | 6.22% | 4–8 | 83.3% | NR |
| Zhou J et al. [80] | No | China, hospital patients | 368 | 23 | 51±16 | 6.25% | 5 | 82.1% | NR |
| Qiao XM et al. [75] | No | China, hospital patients | 15 | 1 | NR | 6.67% | 2 | 100% | not found |
| Hu J et al. [84] | No | China, hospital patients | 117 | 8 | 46.25 ± 17.7 | 6.84% | median 1.8 (1.7–2.3) after discharge | 100% | NR |
| Tao W et al. [85] | No | China, hospital patients | 173 | 12 | NR | 6.94% | 5 | 0% | NR |
| Liu T et al. [86] | No | China, hospital patients | 150 | 11 | median 49 range (37–62) |
7.33% | 2 | NR | NR |
| Chen J et al. [87] | No | China, hospital patients | 1087 | 81 | median 62 range (16–90) |
7.45% | median 1.3 (0.4–2.6) | 84%mild; 16% moderate/severe | NR |
| Zheng J et al. [88] | No | China, hospital patients | 285 | 27 | median 44 range (32–62) |
9.47% | 1 (0.7–1.1) | 37.1% | NR |
| Bongiovanni M et al. [69] | No | Italy, hospital patients | 1146 | 125 | mean 65.7 95%CI (26–95) | 10.91% | 2.9 (95% CI 0.4–6.1) after discharge | 23.2% | NR |
| Zhang K et al. [89] | No | China, hospital patients | 220 | 27 | 22–78 | 12.27% | 1–8 | 22% mild; 77% moderate | NR |
| Tian M et al. [90] | No | China, hospital patients | 147 | 20 | mean 37.2 range (4–80) |
13.61% | 1–6.7 after discharge | 0% | NR |
| Lu J et al. [12] | No | China, hospital patients | 619 | 87 | median 28 range (0.3–69) |
14.05% | 1 (0.3–2.7) after discharge | 0% | NR |
| An J et al. [76] | No | China, hospital patients | 262 | 38 | 94.7% < 60y | 14.50% | 2 | 29% mild; 71% moderate | not found |
| Yuan J et al. [91] | No | China, hospital patients | 172 | 25 | median 28 range 16.3–42 |
14.53% | 1 week ± 0.55 after last negative | 32% mild | NR |
| Wu J et al. [92] | No | China, hospital patients | 60 | 10 | NR | 16.67% | 1–8 | 20% mild | NR |
| Yang C et al. [72] | No | China, hospital patients | 479 | 93 | median 34 95%CI (29–38) | 19.42% | 2–6 | 28% mild | not found |
| Abdullah MS et al. [77] | No | China, hospital patients | 138 | 27 | 41.3 ± 17.0 | 19.57% | 1.5 after discharge | 22% mild | not found |
| Wong J et al. [78] | No | Brunei, hospital patients | 106 | 21 | median 47 | 19.81% | 3–5 | 5% | not found |
| Xiao AT [64] | Yes | China, hospital patients | 70 | 15 | median 64 range (51–73) |
21.43% | 3–7 | NR | NR |
| Li Y et al. [71] | No | China, hospital patients | 13 | 4 | median 37 range (1–73) |
30.77% | 0.7–2 after discharge | 100% | NR |
| Zhang X et al. [93] | No | China, hospital patients | 59 | 19 | NR | 32.20% | NR | 0% | NR |
| Peng D et al. [70] | No | China, hospital patients | 38 | 14 | 7.2±4.8 | 36.84% | 1–5 | 71.4% | not found |
| Zhao W et al. [66] | No | China, hospital patients | 14 | 7 | median 5.7 range (3–7) |
50.00% | median 2 (1–2.4) after discharge | 14.3% | NR |
| Chen LZ et al. [65] | No | China, hospital patients | NA | 44 | 49.68 ± 16.80 | NA | 2 after discharge | >63.6% | NR |
NR not reported, CI confidence interval.