The prevalence of TB is closely related to an area's economic conditions: Backward countries with poor environments and nutrition are often breeding grounds for the disease.
因為結核病的發生和該地區的經濟情況有密切的關係，較貧窮落後的地區，由於環境品質差，營養也不好，經常是結核病盛行的最佳溫床。