Selective area tuberculosis surveys in Singapore 1978

Area of Science:

• Public Health
• Epidemiology
• Tuberculosis Research

Background:

• A 1975 survey in Singapore indicated a significant number of undiagnosed active pulmonary tuberculosis cases, predominantly in older populations.
• Lack of noticeable symptoms in elderly patients contributed to delayed or missed diagnoses.

Purpose of the Study:

• To implement a targeted screening program to identify undiagnosed tuberculosis cases among elderly individuals.
• To assess the effectiveness of mass chest X-ray screening in high-incidence areas for elderly populations.

Main Methods:

• A mass chest X-ray screening program was conducted for individuals aged 45 and above residing in tuberculosis high-incidence zones.
• The study aimed to overcome challenges posed by population displacement due to urban redevelopment.

Main Results:

• The screening program identified fewer cases than anticipated, primarily attributed to population dispersion from urban redevelopment.
• Despite lower yields, the case-finding rate was comparable to the department's most productive programs.

Conclusions:

• Targeted screening can identify tuberculosis cases in older adults, though population mobility may affect yield.
• The study highlights the ongoing challenge of diagnosing tuberculosis in elderly populations and the need for effective screening strategies.