EPIDEMIOLOGICAL STUDY OF ABNORMAL BCG SCARS AMONG PRIMARY AND HIGH SCHOOL PUPILS IN TAIWAN (CHINA) : Part 2. Physical Characteristics of Abnormal BCG Scars

概要

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An epidemiological survey was made of abnormal BCG scars among pupils at the third and fifth grade of primary schools and the eighth and eleventh grade of high schools in the northern part of Taiwan. The overall ratio of pupils with abnormal BCG scars was 28.0%; 4.7% with keloids, 22.2% with hypertrophic scars and 1.1% with atrophic scars. The frequency of keloids increased with age from 1.6% at the third grade to 6.7% at the eleventh grade and it was more frequent among females than males, 8.0% as compared with 5.2%, at the eleventh grade. Each type of abnormal BCG scars is more likely to appear in combination of the same type than would be expected if multiple vaccinations are given. Therefore, it is recommended that revaccination be avoided in case the first BCG scar is found to be abnormal. “Projections like crab claws”, “the mass being larger than the original scars” and “teleangiectasis and tense red margin” are the main characteristics of keloids, which are missing in hypertrophic scars, and considered to be useful diagnostic criteria. Although the frequency of abnormal BCG scars as found in this study is not alarming enough to endanger the implementation of BCG programme in Taiwan at present, attention should be given to the potential danger of this problem and efforts should be made to reduce the frequency of abnormal BCG scars by finding possible means to prevent their formation.
日本結核病学会の論文