World Health Organization contain the last European outbreak in Yugoslavia in 1972. After over two decades of fighting smallpox, the WHO declared in 1979 that the disease had been eradicated – the first disease in history to be eliminated by human effort. Also in 1967, the WHO launched the Special Programme for Research and Training in Tropical Diseases and the World Health Assembly voted to enact a resolution on Disability Prevention and Rehabilitation, with a focus on community-driven care. In 1974, the Expanded Programme on Immunization and the control programme of onchocerciasis was started, an important partnership between the Food and Agriculture Organization
Countdown to Extinction some of the biggest hooks the genre had ever seen". In a retrospective review of the album, Craig Hayes from Popmatters wrote that "Countdown to Extinction"'s "status as a gateway metal album is indisputable" and its "popularity speaks volumes about its significance in the metal canon". The group started the "Countdown to Extinction" tour in 1992 with Pantera, Suicidal Tendencies and White Zombie as the opening acts. They headlined the Roskilde Festival in Copenhagen on June 27 the same year, and continued with dates in Europe during the summer. The tour carried on throughout 1993, with the band making appearances