Table 2. Documented administration of measles-containing vaccines in seronegative healthcare workers in the study hospitalsa .
| Vaccination time and frequency | Hospital A (N = 42) | Hospital B (N = 152) | Total (N = 194) | |
|---|---|---|---|---|
| Childhood | 23 (54.8%) | 117 (77.0%) | 140 (72.2%) | |
| Before 2001 | 4 (9.5%) | 41 (27.0%) | 45 (23.2%) | |
| 2001 | 15 (35.7%) | 60 (39.5%) | 75 (38.7%) | |
| After 2001 | 4 (9.5%) | 16 (10.5%) | 20 (10.3%) | |
| Adulthood (≥18 years old ) | 23 (54.8%) | 18 (11.8%) | 41 (21.1%) | |
| 1 dose | 19 (45.2%) | 15 (9.9%) | 34 (17.5%) | |
| 2 doses | 3 (7.1%) | 3 (2.0%) | 6 (3.1%) | |
| 3 doses | 1 (2.4%) | 0 | 1 (0.5%) | |
| Overall | 33 (78.6%) | 121 (79.6%) | 154 (79.4%) | |
| 1 dose | 19 (45.2%) | 102 (67.1%) | 121 (62.4%) | |
| 2 doses | 10 (23.8%) | 15 (9.9%) | 25 (12.9%) | |
| ≥3 doses | 4 (9.5%) | 4 (2.6%) | 8 (4.1%) | |
aThe measles vaccination history was retrieved from the web-based immunization registry system operated by the Korea Centers for Disease Control and Prevention (https://nip.cdc.go.kr/irgd/index.html))