Which of the following is true for DOTS: March 2012
## **Core Concept**
DOTS stands for Directly Observed Treatment, Short-course. It is a strategy employed by the World Health Organization (WHO) for controlling tuberculosis (TB), particularly in regions with high prevalence and potential for drug resistance. The core principle of DOTS is to ensure patients adhere to the treatment regimen through direct observation.
## **Why the Correct Answer is Right**
The correct answer, ., implies that DOTS involves directly observed treatment to prevent drug resistance and ensure completion of therapy. This strategy includes a short-course chemotherapy regimen, usually lasting 6 months, which consists of an intensive phase with four drugs (rifampicin, isoniazid, pyrazinamide, and ethambutol) followed by a continuation phase with two drugs (rifampicin and isoniazid). Direct observation helps in preventing the misuse of anti-TB drugs, thereby reducing the development of multidrug-resistant TB (MDR-TB).
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because while DOTS does involve a short-course of chemotherapy, the defining feature is the direct observation of treatment, not just the short-course.
- **Option B:** This option is incorrect as it does not accurately reflect the main characteristic of DOTS, which is direct observation to ensure adherence.
- **Option C:** This option might seem plausible but is not the defining feature of DOTS; the strategy indeed focuses on treatment but specifying "sputum conversion" does not encompass the full scope or the unique aspect of DOTS.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that DOTS has been instrumental in controlling TB globally, especially in areas with limited resources. It emphasizes not only the treatment but also the monitoring of patients to prevent the development of drug-resistant strains. A classic clinical correlation is that areas with high TB prevalence and low DOTS coverage are at increased risk of MDR-TB outbreaks.
## **Correct Answer:** . Directly Observed Treatment, Short-course.