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Free Content Outcomes of Category I and II regimens in mono- and polyresistant tuberculosis cases in the Philippines

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SETTING: National Tuberculosis Programme, the Philippines.

OBJECTIVE: To compare treatment outcomes of Category I and Category II regimens among mono- and/or polyresistant tuberculosis (TB) cases under programme conditions.

DESIGN: Retrospective cohort analysis of pulmonary TB patients from two data sets from the National Drug Resistance Survey and the Programmatic Management of Drug-resistant Tuberculosis by linking drug resistance patterns with treatment outcomes.

RESULTS: Of 288 Category I patients, 193 were isoniazid (INH) resistant, 42 were either ethambutol (EMB) or streptomycin (SM) resistant, and 53 were resistant to a combination of two or all three TB drugs. Of 138 Category II patients, 92 were INH-resistant, 9 were either EMB- or SM-resistant, and 37 were poly-resistant. Respectively 206 (87.7%) and 41 (77.4%) mono- and poly-resistant patients treated with the Category I regimen achieved significantly higher successful treatment outcomes, in comparison to respectively 60 (59.4%) and 15 (40.5%) mono- and poly-resistant patients treated with the Category II regimen.

CONCLUSION: The Category II regimen produced poor outcomes, whereas the Category I regimen achieved a treatment success rate of more than 85% among new patients with the same drug resistance patterns. The poor outcomes of the Category II regimen could be attributed to other factors such as patient behaviour and comorbidities, rather than drug resistance.
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Keywords: Category II regimen; mono- and polyresistant TB; treatment outcomes

Document Type: Research Article

Affiliations: 1: *Stop TB, World Health Organization (WHO) Representative Office in the Philippines, Manila 2: National TB Programme, Department of Health, Manila 3: Stop TB, WHO Regional Office for the Western Pacific, Manila, the Philippines

Publication date: February 1, 2016

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  • The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.

    Certain IJTLD articles are selected for translation into French, Spanish, Chinese or Russian. They are available on the Union website

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