Today, wild poliovirus continues to circulate in only two countries, and global incidence of polio cases has decreased by 99%. Since then, more than 2.5 billion children have been immunized against polio thanks to the cooperation of more than 200 countries and 20 million volunteers. When the GPEI started, polio paralysed more than 1000 children worldwide every day. While in New York Holly met Maria Elena Santiago, whom he married two months later. Rotary International launched a global effort to immunize the world’s children against polio in 1985 followed by the establishment of the Global Polio Eradication Initiative (GPEI) in 1988. Following the tour, on 19 June, Holly recorded two songs written by Bobby Darin in New York without the Crickets they remained unreleased but signalled an impending rift between Holly and the group. As a result, during the 1970s routine immunization was introduced worldwide as part of national immunization programmes, helping to control the disease in many developing countries. Lameness surveys during the 1970s revealed that the disease was also prevalent in developing countries. It took somewhat longer for polio to be recognized as a major problem in developing countries.
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