Person-to-person contact may cause most drug-resistant TB ca
The worst form of drug-resistant tuberculosis isn't just arising from inadequate treatment, it's mostly being spread from person to person, according to a new study of hundreds of cases in South Africa that has important implications for how the deadly disease is treated.

Researchers tracked TB that is resistant to at least four key drugs and found that 69 percent of the victims had never received treatment, an indication that they had acquired it from others with extensively drug-resistant TB.

TB develops resistance to drugs when it is attacked with lackluster therapy, allowing the slow-growing bacterium to become insensitive to well-established therapies. Strains that are simultaneously resistant to at least four drugs have been reported in 105 countries....

http://in.reuters.com/article/us-health-tuberculosis-transmission-idINKBN15232I
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