Qa'dah 6, 1435, Sep 1, 2014, SPA -- Japan is urging local authorities to be on the lookout for further outbreaks of dengue fever, after confirming another 19 cases that were contracted at a popular local park in downtown Tokyo, AP reported. The cases announced Monday raise to 22 the number of dengue infections thought to have been contracted locally. The health ministry earlier reported three local cases, the first in nearly 70 years. The disease, which is transmitted only by mosquito, was common in Japan during World War II but was locally eradicated for decades. Dengue causes symptoms including fever, severe joint pain and headaches. There is no treatment, and some of those infected can suffer from severe and life-threatening bleeding.