[A cross sectional survey on the prevalence of active pulmonary tuberculosis in three 'key' elderly population].

Objective: To conduct a survey on the prevalence of active pulmonary tuberculosis among 65 year olds or above. Study subjects would include those with characteristics of TB suspicious symptoms, diabetes and close contacts.

Methods: Purpose-sampling method was applied to choose 3 counties in Shandong province as the study sites, relying on the local basic public health service, for those elderly under 65 years old or above.