Table 2. Number of positive viral isolates from healthy persons by gender and age group.
| Age group | Male | Female | Total | ||||
|---|---|---|---|---|---|---|---|
| (year) | N (%) | No. of healthy persons with positive viral isolation (%) | N (%) | No. of healthy persons with positive viral isolation (%) | N (%) | No. of subjects with positive viral isolation (%) | Number of virus strains |
| <1 | 20 (7.2) | 8 (40.0) | 31 (8.0) | 4 (13.8) | 51 (7.6) | 12 (23.5) | 23** |
| 1 to <3 | 61 (21.9) | 12 (19.7) | 43 (11.1) | 7 (15.9) | 104 (15.6) | 19 (18.3) | 32* |
| 3 to <5 | 62 (22.3) | 14 (22.6) | 53 (13.6) | 7 (13.2) | 115 (17.2) | 21 (18.3) | 33* |
| 5 to <10 | 37 (13.3) | 6 (16.2) | 47 (12.1) | 7 (14.6) | 84 (12.6) | 13 (15.5) | 19 |
| ≥10 | 98 (35.3) | 4 (4.1) | 215 (55.3) | 21 (9.8) | 313 (46.9) | 25 (8.0) | 30 |
| total | 278 (100.0) | 44 (15.8) | 389 (100.0) | 46 (11.8) | 667 (100.0) | 90 (13.5) | 137 |
**Two persons with mixed strain
*One person with mixed strain.