Symptoms Of Dengue No Fever . However, you can still be infected with the other three viruses. It'll protect you from dengue fever, a virus spread through mosquito bites. Dengue Fever (Monsoon Monster): Causes, Signs, Symptoms ... (Vernon Davidson) The symptoms of dengue hemorrhagic fever include headache, rashes and fever besides bleeding in the body (haemorrhage), formation of red splotches on the skin, black coloured Dengue hemorrhagic fever is life threatening and can lead to dengue shock syndrome, which is as severe and fatal. Dengue fever symptoms may be mild initially and mistaken for a flu, cold or a viral infection. However, you can still be infected with the other three viruses. Dengue fever (pronounced "DEN-gi") is a tropical infectious disease caused by the dengue virus. Generally, younger children have a milder illness than older children and adults. dengue fever symptoms,dengue virus effec...