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This year’s biathlon World Cup opener in Ostersund has an unexpected challenge: not only do racers have to vanquish their competitors, they also have to beat the parasites that are making happy homes inside their gastrointestinal tracts. According to The Local, a Swedish news site, 5,000 people in Ostersund are confirmed to have been infected with the parasite cryptosporidium, and it is feared that up to 9,000 could be affected. Officials are still searching for...