Urine PCR evaluation to diagnose pulmonary tuberculosis

Area of Science:

• Medical Diagnostics
• Microbiology
• Infectious Diseases

Background:

• Traditional tuberculosis (TB) diagnosis relies on culture and staining, which are slow and may lack accuracy.
• Obtaining suitable samples for conventional TB diagnostics can involve invasive procedures or be unfeasible.
• There is a critical need for rapid and reliable diagnostic methods for TB.

Purpose of the Study:

• To evaluate the diagnostic utility of urine tuberculosis-polymerase chain reaction (TB-PCR) for identifying pulmonary tuberculosis (PTB).

Main Methods:

• A case-control study involving 77 PTB patients and 30 healthy controls.
• Urine samples were collected for DNA extraction and TB-PCR testing using specific primers.
• Sputum and urine cultures were performed for Mycobacterium tuberculosis identification.

Main Results:

• Sputum culture was positive in 62.3% of PTB patients; urine cultures and acid-fast smears were negative.
• Urine TB-PCR detected TB in 48.0% of patients, with a sensitivity of 56.2% and 100% specificity.
• The control group showed negative results for urine PCR.

Conclusions:

• Urine TB-PCR demonstrates high specificity (100%) and can be a useful diagnostic adjunct for PTB.
• This method is particularly beneficial in cases where obtaining sputum samples is challenging.
• The ease of urine sample collection makes urine TB-PCR a practical diagnostic aid.