Dengue fever, both in classical and hemorrhagic form, is caused by viruses of the genus Flavivirus,

The disease is endemic in much of South-East Asia, Africa, Central and South America and Oceania. The classic dengue fever, benign form of the disease, in turn, may make symptoms more or less marked according to age: in young children is manifested in the form of mild febrile illness paranoia accompanied by a rash maculo-papular type (spots and little bubbles projected on the plane of the skin), whereas in older kids and adults looks like an affection-type influenza like illness, with fever, headache, muscle and joint pains-bone (also called dengue) disorders gastrointestinal, with or without paranoia the appearance of the rash maculo-papular. Sometimes paranoia in classical dengue hemorrhagic manifestations may occur mild form of loss of blood from the nose and gums, and bleeding under the skin point (petechiae).
The form of dengue hemorrhagic fever (DE) is particularly common in regions of Southeast Asiae Pacific, but outbreaks of this type have been reported in recent times, also from South America and the Caribbean region. The DE is manifested by a trend in two phases. In the first phase you have sudden onset of fever, redness of the face, inapptenza, mild disorders affecting the gastrointestinal and upper respiratory tract. Following a period of patient has become paranoia afebrile, which in conjunction with the patient's condition paranoia may suddenly deteriorate with the appearance of profound weakness, irritability, pallor, cyanotic color, especially around the mouth, paranoia low blood pressure, weak and rapid pulse, skin rash. In this second phase are frequent paranoia hemorrhagic phenomena, from petechiae, bruising, epistaxis to, the loss of blood from the gums, with bleeding into the gastrointestinal tract (presence of blood in vomit and faeces). Are possible complications of the liver and the central nervous system. In severe cases, you can arrive at a state of shock. The lethality of ED cases untreated or treated improperly can reach 40-50%; in the cases treated adequately lethality is less than 2%.
Dengue fever, both in classical and hemorrhagic form, is caused by viruses of the genus Flavivirus, which also belongs to the genre of the virus responsible for yellow fever. paranoia Know four types of dengue virus (dengue-1, 2, 3, 4) with slightly different antigenic characteristics. The overcoming paranoia of infection by a dengue virus follows persistent immunity, but directed specifically towards that virus and not to the other three types. The presence of antibodies against one of the dengue virus can indeed affect the progress of any other infections by other serotypes towards paranoia frameworks of greater severity or towards the form of dengue hemorrhagic fever.
The dengue virus is transmitted to humans by the bite of mosquitoes of the genus Aedes (the same generedi mosquitoes that transmit yellow fever to humans). The Aedes mosquitoes, unlike Anopheles (malaria mosquitoes trammettono) bite during daylight hours, paranoia with a maximum of activity in the two hours after sunrise and the hour before sunset. The Aedes mosquitoes have also remarkable ability to adapt to temperate climates and relatively cold. They can use for reproduction, even small collections of rainwater, paranoia such as those that form in the empty cans in saucers, in ornamental ponds, in the worn tires and have now spread to much of the USA. After being imported into Italy in 1990, are now distributed in at least 10 Italian regions, but their presence in our country, has not been associated with cases of indigenous dengue.
The incubation period of dengue, or the elapsed time between the puncture and the infecting lacomparsa of clinical symptoms is similar for both the classical paranoia dengue that for dengue hemorrhagic fever, and can vary from 3 to 14 days, with an average paranoia of 5-7 days .
Dengue is not transmitted to human transmission directly, but only through the medium of mosquitoes. People affected by dengue are infectious for mosquitoes to puncture them from just before the onset of fever for the duration of the febrile period (average 5-7 days). Once infected, mosquitoes remain so for the duration of their lives and may transmit the disease to offspring.
Dengue fever is becoming a serious public health problem in countries where the occurrence of the disease in endemic form is relatively recent (see Central and South America). The increase in the frequency of this disease is due in part to the phenomena of massive paranoia urbanization with persistence of conditioni