It can become 3rd stage dengue fever in a small number of cases, the disease develops into the life-threatening dengue hemorrhagic fever, resulting in bleeding, low levels of blood platelets and blood plasma leakage.
Stage 1: Acute fever and upper respiratory symptoms · Stage 2: Fever subsides · Stage 3: Circulatory failure, neurological problems, and hemorrhaging · Stage 4: Shock and death (10% of all cases reach this stage)
I just recovered from a serious case of Dengue Fever. From what I know Dengue Fever does not spread like the other fevers. If a mosquito bites a Dengue Infected person and then bites you, the Dengue Fever is spread to you.