Dengue fever is an acute infectious disease caused by dengue virus. It spreads mainly through the bite of Aedes aegypti or Aedes albopictus. Its hiding period is 3 to 15 days, mostly 5 to 8 days. Its clinical manifestation is acute onset, which can range from mild fever to high fever, accompanied by severe headache, muscular and pivotal pain and rash, flushing of face, neck and chest. Severe cases may be caused by shock or other factors. Tension organ damage leads to death. The prevailing period is usually from May to November, and the Cenling period is from July to September.

　　Dengue fever is transmitted to humans through the bite of female Aedes mosquitoes carrying dengue virus. The foreword is Aedes aegypti and Aedes albopictus (commonly known as Aedes variegatus). The mosquito likes to lay eggs in still water, such as vases, balconies, outdoor abandoned jars, disposable tableware, tires, bamboo tubes, tree holes, water containers and wet and dark occasions. "Spotted mosquitoes" bite people in the daytime, Cenling from 8 to 9 a.m. and from 5 to 6 p.m. in the afternoon.

　　Disease control experts suggest that not Aedes mosquitoes can spread the disease directly by sucking the blood of dengue fever patients. It is necessary to increase the value of the virus in the salivary glands of Aedes mosquitoes for a period of time before it can spread the disease. There is a section of people infected with dengue virus in the blood, but there is no disease, known as recessive infections, but also can pass the virus to other people through Aedes mosquitoes.

　　How to judge dengue fever?

　　Disease control experts suggest that there are three types of dengue fever: typical dengue fever, mild dengue fever and severe dengue fever. With typical dengue fever, the patient will shiver first, and then fever, up to 40 degrees Celsius, fever has bimodal characteristics. Toxicemia symptoms of the whole body can accompany fever, such as headache, orbital pain, bone junction pain. There is a rash, which appears in the course of 3-6 days. There are hemorrhage, gonorrhea, swollen liver, jaundice, mild dengue fever, epidemic cold, severe dengue fever, typical dengue fever, and energy symptoms and digestive tract hemorrhage.

　　Disease control experts suggest that if these symptoms occur, they should go to the hospital immediately, and tell the doctor the country or region they have visited before; once suspected of dengue fever, they should discontinue treatment as required to prevent the patient from being bitten by mosquitoes to prevent further spread.

　　How to prevent dengue fever?

　　Disease control experts suggest that the best way to prevent dengue fever is to clear water, prevent the breeding of Aedes mosquitoes and stop mosquito bites. How to prevent mosquito bites? Disease control experts suggest that long-sleeved clothes and trousers should be worn and mosquito repellent drugs should be applied to exposed skin and clothes when traveling or living in dengue-endemic areas; mosquito nets or anti-mosquito nets should be installed if there is no air-conditioning equipment in the room. When using household insecticides to kill adult mosquitoes, we should follow the packaging instructions and use appropriate components. We should not spray insecticides directly into electrical appliances or flames in operation in order to avoid explosion. We should stop staying in shade of trees, grasses, pavilions and other outdoor shadows during the frequent occurrence of mosquitoes. We should prevent water accumulation, clear breeding areas of Aedes mosquitoes and stop using water-purified plants as far as possible. In vases and other containers, wash and change water at least once a week. Do not let the chassis of the flowerpot retain water. Put all used cans and bottles into the covered garbage can, and cover the storage containers, wells and pools. All channels should be maintained in circulation, and fill all the hollow places on the ground to prevent water accumulation.