NORMAL tuberculosis can be treated with a course of specific antibiotics.
But XDR-TB is resistant to most forms of drugs and needs specialist treatment.
The World Health Organisation has three definitions of TB, starting with ordinary TB; multi-drug resistant TB (MDR-TB) and extensive drug resistant TB (XDR-TB).
Victims of XDR-TB will be kept in isolation in hospital, usually for several months, until they are no longer infectious.
There then follows two years of treatment while normal TB takes about nine months of treatment.
TB develops slowly in the body and usually takes several months for symptoms to appear. Symptoms include fever and night sweats, an unexplained prolonged cough lasting more than three weeks; unexplained weight loss; and blood in spit.