TOKYO, JAPAN - AUGUST 28: Workers spray pesticide in Yoyogi Park on August 28, 2014 in Tokyo, Japan. Sections of Yoyogi Park were closed to the public today as they underwent fumigation after three people were diagnosed with dengue fever after suffering mosquitoe bites in the park. According to a Health Ministry statement, these were the first domestic cases of dengue fever in Japan in 70 years. (