The study was conducted in 1997 and comprised 319 never-jailed drug addicts aged 18–50 years admitted to a correctional centre in Shiraz, southern Islamic Republic of Iran. Standard Mantoux test was performed for all individuals upon their admission to the centre. The diameter of induration at the site of inoculation was measured for each after 72 hours and the results were recorded in millimetres. Those with induration of 10 mm or more were given chest X-rays. For those with a positive radiological finding for pulmonary TB, a direct smear test for acid-fast bacilli was performed. Sputum cultures were performed for those with negative smears.
