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Seroconversion rates with respect to strains Inaba and Ogawa by age group
| Age group (yr) | No. of subjects examined (% seroconverted) |
|
|---|---|---|
| Inaba | Ogawa | |
| <18 | 33 (70) | 32 (34) |
| 18-30 | 417 (55) | 414 (36) |
| 31-40 | 250 (44) | 249 (28) |
| >40 | 277 (33) | 271 (22) |
| Total | 977 (46) | 966 (30) |
