Factors Influencing Early Sputum Culture Conversion in Pulmonary Drug-resistant Tuberculosis

Area of Science:

• Pulmonology
• Infectious Diseases
• Public Health

Background:

• India faces the highest global burden of tuberculosis (TB).
• Drug-resistant TB (DR-TB), including multidrug-resistant TB (MDR-TB), presents significant treatment challenges.
• Sputum culture conversion is a critical early indicator of successful TB treatment.

Purpose of the Study:

• To evaluate the time to early sputum culture conversion (within 6 months) in DR-TB patients in India.
• To identify factors influencing early culture conversion across various DR-TB resistance patterns (MDR, MDR with fluoroquinolone resistance, MDR with second-line injectable resistance, and extensively DR-TB [XDR-TB]).

Main Methods:

• A prospective cross-sectional observational study was conducted in India.
• Seventy-four DR-TB patients were enrolled between January and October 2019.
• Demographic data, comorbidities, and culture conversion times were analyzed using Chi-square tests and univariate logistic regression.

Main Results:

• Over half (52%) of MDR-TB patients achieved culture conversion within 3 months; pre-XDR and XDR cases converted within 2 months.
• Factors significantly associated with delayed sputum culture conversion included smoking, low body mass index (BMI), cavitary lesions on chest X-ray, and lower socioeconomic status.

Conclusions:

• Early sputum culture conversion is a crucial milestone in the treatment of DR-TB.
• Addressing modifiable risk factors like smoking, undernutrition, and cavitary disease is essential for improving treatment outcomes.
• Further research is needed to develop interventions that accelerate culture conversion and enhance treatment success in DR-TB patients.