The objectives of this study were to determine: 1. the proportion of
sputum smear-positive pulmonary tuberculosis (PTB) cases who failed to
smear convert at 2 months, 2. their management, and 3. whether baseline
characteristics and final treatment outcomes were different from those
who did smear convert.
The study was a cross-sectional retrospective review of medical files,
tuberculosis (TB) registers and TB treatment records of new
smear-positive PTB patients registered from January to December 2010.
Of 925 patients, 840 were available to submit sputum at 2 months, of
whom 137 (16%) were smear-positive. Baseline sputum smears showing 3+
acid-fast bacilli and missing doses of anti-tuberculosis drugs during
the initial phase of treatment were significantly associated with being
smear-positive at 2 months. Management was poor: of 137 patients, 46
(34%) submitted sputum for culture and drug susceptibility testing and
Mycobacterium tuberculosis was cultured in six cases; 120 (88%) received
a 1-month extension of the initial phase, and of the 30 patients still
smear-positive at 3 months there were no culture results available.
Final treatment outcomes were similar, regardless of smear conversion at
2 or 3 months.
Certain characteristics were risk factors for failure to smear convert
at 2 months. However, treatment outcomes for all patients were good.
These findings have implications for the modification of national
Jayakody, W.; Harries, AD.; Malhotra, S.; de Alwis, S.; Samaraweera, S.; Pallewatta, N. Characteristics and outcomes of tuberculosis patients who fail to smear convert at two months in Sri Lanka. Public Health Action (2013) 3 (1) 26-30. [DOI: 10.5588/pha.12.0090]
Characteristics and outcomes of tuberculosis patients who fail to smear convert at two months in Sri Lanka.