To prevent dengue fever, mosquito bites should be prevented.

　　Dengue fever is caused by dengue virus. It is an acute infectious disease with fever, rash and pain as its main symptoms transmitted by Aedes mosquito bites. The mortality rate of severe dengue fever is as high as 20%, which has become an increasingly serious health threat in recent decades. The World Health Organization (WHO) has released a list of the major threats to global health in 2009. Dengue fever in the list has attracted wide attention and has been listed as a major health problem. Dengue fever usually occurs in summer and autumn. According to the notification of Guangdong CDC, Guangdong has entered the peak season of dengue fever incidence.

　　So, what mosquitoes are so powerful? How does the dengue virus spread? How to prevent and cure it?

　　Transmission of dengue virus

　　According to doctors, the main vectors of dengue fever are Aedes aegypti and Aedes albopictus, and most of them are Aedes albopictus in our province. The virus is transmitted to humans through mosquito bites. Mosquitoes usually acquire the virus by feeding on infected human blood. Infected mosquitoes can transmit the virus throughout their lives, and a few can transmit the virus to their offspring through eggs.

　　The main symptoms of dengue fever are: sudden high fever, within a day or two, the body temperature rises to 39 to 40 degrees Celsius, the high fever usually lasts for a week; body pain, headache, orbital pain, muscle and joint pain and skeletal pain, the whole person feels very tired; flushing, red face, neck, chest and limbs skin, looks like "drunken", very much. To appear conjunctival congestion, superficial lymph node enlargement, gingival bleeding, etc., rash: mainly measles-like and hemorrhagic rash, not higher than the skin.

　　Clinical manifestations of dengue fever

　　The incubation period of dengue fever is generally 3-15 days, most of which are 5-8 days.

　　Dengue virus infection can be manifested as asymptomatic recessive infection, non-severe infection and severe infection. Dengue fever is a systemic disease with complex clinical manifestations. The typical course of dengue fever is divided into three stages: acute fever, extreme fever and convalescence. According to the severity of the disease, dengue fever infection can be divided into two clinical types: common dengue fever and severe dengue fever.

　　Acute fever usually occurs in patients with acute onset, the first symptom is fever, can be accompanied by chills, within 24 hours the body temperature can reach 40 degrees Celsius. In some cases, the body temperature dropped to normal after 3-5 days of fever and rose again after 1-3 days. Fever can be accompanied by headache, pain in muscles, bones and joints, marked weakness, nausea, vomiting, abdominal pain, diarrhea and other gastrointestinal symptoms.

　　Acute fever usually lasts for 2 to 7 days. Congestive rash or punctate hemorrhagic eruption occurred on the face and extremities on the 3rd to 6th day of the course of the disease. Typical rashes are needle-like bleeding spots and "skin island" like manifestations in the extremities. Hemorrhage may occur in different degrees, such as subcutaneous hemorrhage, blood stasis at injection site, gingival bleeding, epistaxis and positive brachial bundle test.

　　At the extreme stage, some patients with persistent high fever or worsened after fever abatement may have obvious plasma leakage due to increased capillary permeability, and shock and other important organ damage may occur in severe cases. The extreme stage usually occurs on the 3rd to 8th day of the disease. Severe early warning signs such as severe abdominal pain and persistent vomiting often indicate the beginning of the extreme period.

　　Two to three days after the end of the recovery period, the patient's condition improved, gastrointestinal symptoms alleviated, and entered the recovery period. Some patients can see needle-like bleeding points, lower limbs are more common, there can be skin itching. Leukocyte count began to rise and platelet count gradually recovered.

　　Most of the patients presented with general dengue fever, a few developed severe dengue fever, and some only had fever and convalescence.

　　Is it necessary to isolate dengue fever diagnosed? Doctors reminded that if diagnosed as dengue fever, mosquito-proof isolation treatment is needed in hospitals to prevent the virus from being transmitted to family members or other people through mosquito bites. The isolation time is usually about 5 days. The course of the disease is more than 5 days, and fever can be released for more than 24 hours. Patients with dengue fever can be discharged from hospital with fever abating for more than 24 hours and clinical symptoms alleviating.

　　Prevention of dengue fever

　　Doctors say that dengue fever is not transmitted from person to person, mosquitoes are its vector, so the effective way to control dengue fever Zui is to kill mosquitoes.

　　To prevent dengue fever, breeding areas should be treated, mosquito larvae should be eliminated, ditches and sewers should be dredged, water accumulation should be prevented, depressions should be filled, pots should be turned over to remove water accumulation. Avoid cultivating plants in clear water as far as possible. For vases and other containers, wash and change water at least once a week. Do not allow water to accumulate in the chassis of the pot. Put all the used cans and bottles into the covered trash can to destroy the breeding grounds of Aedes albopictus.

　　To prevent dengue fever, it is necessary to kill adult mosquitoes by ultra low volume spray or hot aerosol method. Indoor mosquito repellent incense, mosquito killing lamp, electric mosquito killing tablets, mosquito killing pads, bottled insecticide aerosol and so on can be used.

　　To prevent dengue fever, residents should install mosquito screens for residential or office buildings, wear long-sleeved clothes and trousers when going out, and apply mosquito repellent drugs on exposed skin and clothes. Keep away from mosquito breeding areas such as stagnant water.