Second-line drug susceptibilities of multidrug-resistant tuberculosis strains isolated in Thailand: an update.

The increasing incidence of multidrug-resistant tuberculosis (MDR-TB) and the emergence of extensively drug-resistant tuberculosis (XDR-TB) globally hamper the successful treatment and effective control of TB. Information on second-line drug susceptibility, which is of utmost importance for patient care, is still limited. This study demonstrates the susceptibilities of 1447 strains of MDR-TB, including 58 XDR-TB strains, isolated from Siriraj Hospital, Bangkok, Thailand, to aminoglycosides, fluoroquinolones, ethionamide (ETH), para-aminosalicylic acid (PAS) and linezolid.

Eleven-year experience on anti-TB drugs direct susceptibility testing from Siriraj Hospital, Thailand.

The early detection of drug-resistant tuberculosis (TB) strains is of utmost importance for patient management and effective TB control programs. This study aimed to demonstrate the performance of direct drug susceptibility testing (DST) performed in our laboratory in the past 11 years. The direct DST was performed on Middlebrook 7H10 medium using isoniazid (INH) and rifampicin (RIF), and the results were compared with those obtained from indirect DST (gold standard).

One-tube multiplex PCR method for rapid identification of mycobacterium tuberculosis.

A rapid, inexpensive, simple, and accurate multiplex polymerase chain reaction (PCR) was developed in a single tube for identification of Mycobacterium tuberculosis. Assessment of sensitivity and specificity of simple PCR was performed with 116 strains of M. tuberculosis complex (MTC) and 144 strains of nontuberculous mycobacteria (NTM) compared with the biochemical method.

Distribution of hsp65 PCR-restriction enzyme analysis patterns among Mycobacterium avium complex isolates in Thailand.

A total of 227 clinical Mycobacterium avium complex isolates from Thailand were differentiated into species and types by using PCR-restriction enzyme analysis of hsp65. The distribution of types showed the predominance of M. avium I (77%) in blood specimens, whereas M.

Evaluation of polymerase chain reaction and restriction enzyme analysis for routine identification of mycobacteria: accuracy, rapidity, and cost analysis.

Polymerase chain reaction and restriction enzyme analysis (PCR-REA) of the hsp65 gene was evaluated for use as a routine identification method for identifying mycobacteria. The accuracy, rapidity, and cost were assessed compared with the conventional biochemical method. Five hundred and forty-one mycobacterial clinical isolates obtained from the Department of Microbiology, Faculty of Medicine at Siriraj Hospital, Mahidol University, were submitted for PCR-REA and biochemical identification.