Brazilian teams are on alert because of a dengue fever outbreak that is affecting some of the country’s top clubs. Three players were diagnosed with the mosquito-borne disease this week, while clubs have been supplying insect repellent during training. Cases of dengue fever have increased significantly across Brazil this year, with most of them reported in Sao Paulo state. Corinthians midfielder Renato Augusto said some of the club’s players have been training with pants and long sleeves to try to avoid the mosquitoes. Brazil’s health ministry said there have been more than 460,000 cases of the disease in the country in 2015, while more than 130 people have died this year already.