Ultra-lethal TB sends fear through Africa 10:30 17 September 2006 From New Scientist Print Edition. African countries last week agreed a plan to tackle a new and ultra-lethal strain of tuberculosis called Extensive Drug Resistant TB (XDR-TB). It is especially harmful to people infected with HIV, killing 52 out of 53 HIV-positive people who caught it after attending a clinic in KwaZulu-Natal, South Africa, earlier this year. All were infected with the same strain, suggesting that one infected person spread it to all the rest. Most died within 25 days - long before the three months it takes to get...