by Anita Slomski
Newly identified strains of Mycobacterium tuberculosis have emerged in South Africa and elsewhere that some experts say might make treating TB nearly impossible, especially for vulnerable populations. South Africa, which has the fourth-largest prevalence of multidrug-resistant TB (MDR-TB) in the world (after China, India, and the Russian Federation), is now the fourth country to report the emergence of a virtually untreatable strain of TB. India, Iran, and Italy have also published reports of “totally” drug resistant (TDR-TB). And experts warn it is just a matter of time before the TDR-TB spreads around the world.