Table. Myocarditis Cases Following the BNT162b2 Vaccination Among 43 Adolescents in Hong Kong Before and After the Single-Dose Policy.
| Variable | Male (n = 38 [88%]) | Female (n = 5 [12%]) | Total (n = 43 [100%]) |
|---|---|---|---|
| Age, mean (SD), y | 14.95 (1.35) | 14.20 (2.17) | 14.86 (1.46) |
| Before single-dose recommendation | |||
| Cases, No. | 38 | 5 | 43 |
| Doses administered, total No. | 181 392 | 177 405 | 358 797 |
| Adolescents who received vaccination, total No. | 102 242 | 100 073 | 202 315 |
| After single-dose recommendation | |||
| Cases, No. | 0 | 0 | 0 |
| Doses administered, total No. | 14 386 | 13 895 | 28 281 |
| Adolescents who received vaccination, total No. | 11 525 | 10 720 | 22 245 |
| Overall observational period | |||
| Cases after first dose, No./recipients of first dose, total No. | 6/113 767 | 1/110 793 | 7/224 560 |
| Incidence after first dose per 100 000 persons (95% CI) | 5.27 (1.94-11.48) | 0.90 (0.023-5.03) | 3.12 (1.25-6.42) |
| NNH for the first dose (95% CI) | 18 975 (8711-51 546) | 111 111 (19 881-4 347 826) | 32 051 (15 576-80 000) |
| Cases after second dose, No./recipients of second dose, total No. | 32/82 011 | 4/80 507 | 36/162 518 |
| Incidence after second dose per 100 000 persons (95% CI) | 39.02 (26.69-55.08) | 4.97 (1.35-12.72) | 22.15 (15.51-30.67) |
| NNH for the second dose (95% CI) | 2563 (1816-3747) | 20 121 (7862-74 074) | 4515 (3261-6447) |
Abbreviation: NNH, number needed to harm.