Region | Hokkaido/Tohoku | Kanto | Chubu | Kinki | Chugoku | Shikoku | Kyushu | Total |
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Age (years) |
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0–19 | 6 | 14 | 8 | 8 | 4 | 2 | 4 | 46 |
20–39 | 6 | 18 | 8 | 10 | 4 | 2 | 8 | 56 |
40–59 | 8 | 22 | 10 | 12 | 4 | 2 | 8 | 66 |
60- | 8 | 26 | 14 | 14 | 4 | 2 | 10 | 78 |
Total | 28 | 80 | 40 | 44 | 16 | 8 | 30 | 246 |
- Specimens were provided by the serum bank of the National Institute of Infectious Diseases in Japan. The number of males and females is equal. The main cities (latitude/longitude) in each region are Sapporo/Sendai (43° 03′ 51″ N, 141° 20′ 49″ E / 38° 16′ 08″ N, 140° 52′ 19″ E) in Hokkaido/Tohoku, Tokyo (35° 41′ 22″ N, 139° 41′ 30″ E) in Kanto, Nagoya (35° 10′ 49″ N, 136° 54′ 24″ E) in Chubu, Osaka (34° 41′ 11″ N, 135° 31′ 12″ E) in Kinki, Hiroshima (34°23′47″ N, 132° 27′ 34″ E) in Chugoku, Takamatsu (34° 20′ 25″ N, 134° 02′ 36″ E) in Shikoku, and Fukuoka (33° 36′ 23″ N, 130° 25′ 05″ E) in Kyushu