东欧受到感染的程度最严重，而在西欧，伦敦的肺结核患病率是所有首都之最。

Eastern Europe has the highest level of infection, while in Western Europe, London has the highest TB rate of any capital city.

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在英国，肺结核患病率的减少早于抗生素的发明，这是因为英国贫穷人口逐渐减少，生活环境日益改善。

Tuberculosis in England was in decline before the invention of antibiotics; this was because there were less poor people in England, and living conditions were better.

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然后，依据PPD反应强度及活动性肺结核病人检出情况测算结核感染率及患病率。

Then, calculate tuberculosis infectious rate and morbidity according to PPD reaction intensity and finding of active tuberculosis patients.

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