Health experts are to hold an emergency meeting in Johannesburg this week, following the discovery of a deadly new strain of tuberculosis. The strain - known as extreme drug-resistant TB - has horrified World Health Organisation doctors. In one outbreak in South Africa, 52 of 53 patients died within weeks of becoming infected.'This new strain leaves us facing a nightmare,' said Paul Nunn, coordinator of the WHO's drug-resistance unit. 'It is resistant to nearly every drug in our arsenal. We are now on the threshold of the appearance of a strain of TB that is resistant to every medicine known to science.'
The strain was originally discovered by scientists earlier this year. They looked at cases of multiple drug-resistant TB - which has developed over the past decade in many parts of the world - and discovered that among these a worrying new 'extreme' strain had evolved.