Unfortunatelly the dengue illness is growing very fast in Rio. Some areas in town are totally critical. The infected people rates are vey high. Please use intensively mosquito repellent or similar protection and carry it with you anywhere.
the symptons for the non-hemorrhagic one, the most lethal of all the known types, mailnly for children and babies, are: high fever, pain in the body, headache, pain between the bones and others. The symptons are similar to a flu or grippe so it is a big problem to get asap the diagnoses by the doctors.
If you don't feel well , please don't take aspirine or similar medications, go direct to the hospital.
Here is a website in Portuguese: Protected content