在发达国家人群中（肺结核）再感染是极可能的，但发生几率低于那些高危地区。

Re-infection is possible among people in developed countries, but the rates are lower than those occurring in high-risk areas.

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结论老年性肺结核的X线表现随着结核类型(新感染或再感染)而不同。

Conclusion X-ray findings of senile pulmonary tuberculosis on the chest films with clinical course (newly detected or reinfection tuberculosis) are different.

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结论外源性再感染是上海地区结核病复发的重要原因；

Conclusions Exogenous reinfection was a major cause of tuberculosis recurrence in Shanghai.

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结论外源性再感染是上海地区结核病复发的重要原因；

Conclusions Exogenous reinfection was a major cause of tuberculosis recurrence in Shanghai.

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