This is an automatically translated article.
The article was professionally consulted with Senior Doctor, Dr. Vu Van Tam - Infectious Internal Medicine - Department of Medical Examination & Internal Medicine - Vinmec Ha Long International General Hospital.Dengue fever is a disease caused by Dengue virus, there is currently no specific treatment and vaccine for the disease, so dengue fever can cause large epidemics. Patients with severe dengue can lead to death, causing great socio-economic losses. Understanding dengue epidemiology as well as which seasons are susceptible to dengue will help to be more proactive in prevention.
1. About Dengue fever
Dengue hemorrhagic fever is an infectious disease that can be transmitted from sick people to healthy people through female Ae mosquitoes. aegypti and Ae. albopictus . The causative agent is Dengue virus, belonging to the family Flaviviridae, including 4 serotypes: DEN-1, DEN-2, DEN-3, DEN-4. The disease has no treatment or vaccine, so effective prevention is vector control and prevention.
The World Health Organization divides Dengue hemorrhagic fever into three levels: Dengue hemorrhagic fever, Dengue with warning signs and Severe dengue.
Virus Dengue gây bệnh sốt xuất huyết
2. Epidemiology of Dengue fever
Worldwide Dengue fever is endemic in more than 100 countries, from tropical to subtropical regions and some other areas of the Americas, Africa, Eastern Mediterranean, Southeast Asia and Western Pacific Positive. In which, Southeast Asia and the Western Pacific are the most affected regions.
All 4 types of dengue virus are currently circulating in Asia, Africa and the Americas. However, because of early detection and good management, the reported mortality rate has been much lower in recent years than the number of deaths in the decades before 2000.
When Dengue Hemorrhagic Fever Occurs If complications occur, the probability of death will increase very high as in India, Indonesia and Myanmar, the mortality rate is from 3-5%. The disease has a severe impact in Asian countries and is one of the leading causes of hospitalization and death in children.
In Vietnam In our country, the dengue epidemic occurring in the South dominates the number of cases of the whole country. Every year, Vietnam records an average of 80,000 - 100,000 cases of dengue fever, including dozens of deaths. Crowded areas with a habit of storing clean water in tools (lu, jar, khap, lake...), construction sites where there are many waste objects containing standing water are favorable environments for disease outbreak. The control and timely response to dengue fever is extremely important. So which season is prone to dengue fever?
Những nơi muỗi truyền bệnh sốt xuất huyết sống
Which season is most susceptible to dengue of the year Dengue fever often causes epidemics in the rainy season months, when the average temperature in the month is high. In the South and Central regions, dengue fever can occur all year round. In the North and Central Highlands, the disease usually occurs from April to November. According to data recorded in 2019, Dengue hemorrhagic fever develops most strongly in July, August, September and October. November - Dengue fever outbreak strongly. The cycle of each epidemic is about once every 3-5 years, usually after a number of small epidemic cycles there will be a large epidemic cycle again.
Mode of transmission The vector of transmission is the female mosquito Ae. aegypti and Ae. Albopictus. The virus is transmitted by mosquito bites, mainly Aedes aegypti mosquitoes - mosquitoes that like to suck blood during the day, usually early morning and late afternoon, can bite many times if not full of blood. Adult mosquitoes usually reside in dark corners, preferring to lay eggs in containers with clean water. Aedes mosquitoes thrive in the rainy season when the average temperature rises above 20 degrees Celsius. Aedes albopictus mosquito species has little role in disease transmission because it does not feed on human blood and can live in nature and mountains.
Mosquitoes that transmit dengue often lay their eggs in clean water containers in the house, around the house such as barrels, jars, jars, water containers, flowerpots, abandoned bins, garbage, damaged tires with standing water. Even mosquito eggs can withstand very dry conditions and live for many months, when exposed to the egg will hatch. In a female mosquito's life, she can lay 5 times, each time several dozen eggs.
Muỗi truyền bệnh sốt xuất huyết
3. Where does Dengue fever usually appear?
In Vietnam, fever occurs in all three regions of the North-Central-South and Central Highlands, from urban to rural areas. The disease was most recorded in the Southern, Central and Central Highlands provinces. In some provinces in the Northern Delta and coastal areas, the Northern mountainous provinces are less common. In recent years, the number of dengue fever cases in the Northern provinces has also increased, especially in Hanoi, which tends to increase rapidly. Hanoi is the hot spot of dengue fever epidemic in the North.
Knowing which season is prone to dengue fever will help to be more proactive in prevention and ensure the health of loved ones and family.
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