Effect of drug resistance on negative conversion of sputum culture in patients with pulmonary tuberculosis.

Effect of drug resistance on negative conversion of sputum culture in patients with pulmonary tuberculosis.

Int J Infect Dis. 2015 Dec 9;

Authors: Kim J, Kwak N, Lee HY, Kim TS, Kim CK, Han SK, Yim JJ

Abstract
OBJECTIVE: Negative conversion of sputum culture is a useful marker for predicting treatment outcome and relapse of pulmonary tuberculosis (TB). We evaluated the effect of drug resistance on negative conversion of sputum culture with treatment.
DESIGN: A total of 535 patients with culture-proven pulmonary TB were classified into three groups: drug susceptible (DS), other drug resistance (ODR), and multidrug resistance/extensive drug resistance (MDR/XDR). Rates of conversion of sputum culture at 4, 8, and 12 weeks were compared.
RESULTS: At 4 weeks of treatment, the conversion rate in the DS group (52.7%) was higher than that in the ODR group (30.8%, P=0.003), but it was not different compared with the MDR group (45.7%, P=0.427). At 8 weeks, the conversion rate in the DS group (76.3%) was higher than that in the ODR (63.5%, P=0.042) and MDR groups (60.0%, P=0.031). At 12 weeks, the conversion rate in the DS group (85.9%) tended to be higher than that in the MDR group (74.3%, P=0.062), but was not different from that in the ODR group (84.6%, P=0.796).
CONCLUSION: The pattern of resistance to anti-TB drugs affects culture conversion rates at the early phase of treatment and also prolongs the time to culture conversion.

PMID: 26692454 [PubMed - as supplied by publisher]