There's a dengue epidemic in Rio de Janeiro. Another type - 4 - of the disease has worsened matters.
This is so because most residents have already had the disease and, when contracting a different type of it, the existence of antibodies due to the previous infection enhances symptons.
For details including treatment, we suggest this link:
http://www.health.qld.gov.au/dengue/dengue_fever/disease.asp
