TOKYO, Sept. 4 (Xinhua)-- The Tokyo metropolitan government has found mosquitoes carrying dengue virus within Yoyogi Park, a large open space in central Tokyo where nearly 50 people were suspected to get infections, local media reported Thursday.
Since the country confirmed the first locally transmitted case last week, the number of sufferers of dengue fever has risen to 49.
As all of the sufferers recently spent time in or around the park, the government placed mosquito traps at 10 locations in the park. Experts of Tokyo Metropolitan Institute analyzed the trapped mosquitoes on Wednesday, founding most of them carried the virus, said Japan's JiJi News Agency.
The Tokyo metropolitan government decided to block part of the park since Thursday afternoon, prohibiting residents from entrancing in.
Dengue fever does not spread directly from person to person. The last official outbreak of dengue fever was recorded in Japan in 1945, but the disease, which often spreads in tropical and subtropical areas, was locally eradicated for decades.