The muscles and joints ache, and a rash appears on the chest and arms.
Chances are anyone with such symptoms is suffering from dengue fever.
And Southeast Asia is witnessing a startling upsurge in cases this year. More than 21,000 people in Indonesia are reported to be infected, and 490 have died so far. With at least 5,800 cases in Jakarta, authorities may have to erect tent hospitals to deal with the rising number of patients. In the first three months alone, dengue has claimed 31 lives and infected about 10,200 people in Thailand, triple the number in the same period last year. And there is no treatment for the virus, which is carried by the Aedes mosquito.