Shanghai reported 9 cases of imported dengue fever. Where did these cases come from?

Imported from Cambodia, the Philippines and other Southeast Asian countries. At present, relevant departments in Shanghai are actively participating in the prevention, control and publicity of dengue virus.

As of August 7, there have been 9 cases of imported dengue fever in Shanghai, and the city is promoting mosquito control. CDC experts call on people to be alert to the spread and infection of dengue fever.

Dengue fever is an acute insect-borne infectious disease caused by the spread of dengue virus through mosquitoes. The only vector is Aedes mosquitoes, which mainly occurs in tropical and subtropical regions. Guangdong, Macau and Hongkong in China are all located in the subtropical zone, and dengue virus is prevalent. Dengue virus mainly breaks out from July to September every year. At this time, due to the hot weather, the number of mosquitoes as a vector of virus transmission increased.

People of all ages are susceptible to infection, and the average incubation period of the virus is 4 to 7 days. Infected people can detect dengue virus by routine urine test and peripheral blood picture, and can also detect whether they are infected with dengue virus by nucleic acid test, serum immunology test and virus isolation. According to the symptoms, the virus can be divided into three levels: mild, typical and severe, and each level has its own clinical manifestations. At present, there is no effective pathogen treatment for dengue virus, and conventional treatment is generally used, supplemented by lowering body temperature, intracranial pressure, rehydration and hemostasis. Generally, only seriously ill patients will die.

At present, all cases of dengue fever in China are imported patients. According to a report released by Fujian, the risk level of dengue virus outbreak in Fujian is higher than that in COVID-19. The risk of dengue fever infection in open coastal cities in China is much higher than that in inland provinces, such as Guangdong, Hong Kong and Macao and other economically developed coastal areas. These high-risk areas need to guard against the importation of dengue cases, so as to prevent dengue virus from spreading through mosquitoes in China, infecting people and causing public panic again.