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Blood samples were collected from 140 institutionalized children aged 0~9 at Goyang gun. Kyunggi Do, Korea. The venous blood was taken and isolated serum was used for Haemagglutination(HA) test.1. Out of 140 samples, the positive rate of HA titer was 35.7 per cent. No significant differences was recognized by sex gropus. 2. When subdivided into the 0~4 and 5~9 years... |
