On Wednesday 27 August, a case of infection for Dengue Fever had been reported in Saitama Japan.
On the next day further two cases were reported in Saitama and Tokyo.
Three patients were the classmates of the college in Tokyo and they met together at a park in Shibuya 1 week ago.
The MOH in Japan estimates that they must be infected in this opportunity.
Today the government of Tokyo Metropolitan had disinfected around the park.
However the origin of the infection is not found yet.
It means the potential risk of Epidemic is still remaining.