TABLE 1.
Risk Factor for SARS-CoV-2 Reinfection Cases, Jan 2022–Aug 2022, South Korea
| Variables | Reinfection | /Total infection | (%) | Incidence* | aHR | (95% CI) |
|---|---|---|---|---|---|---|
| Total | 154,924 | 17,543,961 | (0.9) | 6.15 | ||
| Sex | ||||||
| Male | 69,444 | 8,209,962 | (0.8) | 5.88 | Ref. | |
| Female | 85,480 | 9,333,999 | (0.9) | 6.38 | 1.18 | (1.17–1.20) |
| Age group (yrs) | ||||||
| 0–4 | 10,015 | 820,843 | (1.2) | 8.46 | 1.13 | (1.10–1.16) |
| 5–11 | 49,123 | 1,944,653 | (2.5) | 17.32 | 2.20 | (2.15–2.26) |
| 12–17 | 12,457 | 1,324,395 | (0.9) | 6.49 | 2.00 | (1.95–2.05) |
| 18–39 | 43,912 | 5,560,239 | (0.8) | 5.47 | 1.70 | (1.67–1.72) |
| 40–59 | 22,907 | 4,842,637 | (0.5) | 3.30 | Ref. | |
| 60–74 | 11,021 | 2,224,252 | (0.5) | 3.51 | 1.03 | (1.01–1.06) |
| 75+ | 5,489 | 826,942 | (0.7) | 4.74 | 1.16 | (1.12–1.20) |
| Residence | ||||||
| Capital area | 79,920 | 9,172,732 | (0.9) | 5.99 | Ref. | |
| Non-capital area | 75,004 | 8,371,229 | (0.9) | 6.32 | 1.13 | (1.12–1.14) |
| Health status | ||||||
| Immunocompromised | 2,620 | 447,934 | (0.6) | 4.12 | 1.23 | (1.18–1.28) |
| LTCF residents | 4,182 | 293,178 | (1.4) | 9.84 | 2.34 | (2.26–2.43) |
| General population | 148,122 | 16,802,849 | (0.9) | 6.13 | Ref. | |
| Vaccination status† | ||||||
| Unvaccinated | 143,804 | 15,958,222 | (0.9) | 6.30 | Ref. | |
| 1-dose | 10,689 | 1,555,628 | (0.7) | 4.59 | 0.94 | (0.92–0.96) |
| 2-doses | 427 | 29,542 | (1.4) | 9.26 | 0.54 | (0.49–0.59) |
| 3-doses+ | 4 | 569 | (0.7) | 4.16 | 0.20 | (0.07–0.53) |
*
Incidence per 100,000 person-days.
†
Vaccination status, post-primary infection and before reinfection.
aHR indicates adjusted hazard ratio (adjusted for sex, age, residence, health status, vaccination status); LTCF, long-term care facility.