Dengue is a viral disease spread by the bite of an infected mosquito. Symptoms can include fever, headache, vomiting and muscle aches. In some cases, dengue infection can lead to more serious complications such as internal bleeding, diarrhea or breathing problems. Signs range from a mild fever to extremely high fevers. Some kids may also have bleeding gums, or nose bleeds, abdominal pain, nausea & vomiting. Other symptoms may include a red rash that develops on the body and inside the mouth.