Dengue Fever Outbreak in Hanoi: A Growing Health Concern


Dengue fever, a mosquito-borne viral illness, has long posed a significant public health threat in Vietnam. The nation experiences an ongoing battle with the disease, with risks typically escalating during and immediately after the rainy season. Recently, health officials in Hanoi reported alarming figures related to the outbreak, underscoring the urgency of addressing this public health crisis.

The Escalating Dengue Fever Outbreak in Hanoi

Health officials in Hanoi have raised serious concerns over the escalating dengue fever outbreak in the city. From September 20th to October 9th, an additional 7,602 cases were reported, bringing the total case count in Hanoi to a staggering 17,974 cases since the beginning of the year. This figure is more than three times higher than the number of cases reported during a similar period in 2022, pointing to a worrisome trend of increasing dengue fever activity.

The affected districts within Hanoi that are grappling with high disease activity include Thach That, Hoang Mai, Thanh Tri, Ha Dong, Phu Xuyen, Dong Da, Quoc Oai, Cau Giay, and Nam Tu Liem. These areas have witnessed a surge in dengue fever cases, necessitating immediate and comprehensive public health responses.

Dengue Fever: A Persistent Threat in Vietnam

Dengue fever is not a novel concern for Vietnam; it is a nationwide, year-round threat. The risk, however, tends to peak during and immediately following the rainy season. In the northern part of the country, this occurs from May to October, while in the central coastal areas, the heightened risk period stretches from September to December.

The annual incidence of dengue fever in Vietnam has been a cause for concern in recent years. In 2022, Vietnam reported approximately 367,729 cases of dengue fever, a substantial increase from the 71,000 cases reported in 2021 and the over 133,000 cases reported in 2020.

These figures indicate a disturbing upward trajectory in the prevalence of dengue fever within the country, with this year’s outbreak in Hanoi serving as a stark example of the issue’s gravity.

Prevention and Control Measures

In response to the ongoing dengue fever outbreak, local health officials in Hanoi have been actively implementing various campaigns and strategies aimed at mitigating the crisis. Key among these measures is a focus on boosting environmental sanitation and eliminating mosquito breeding sites. The campaign encourages individuals and communities to take proactive steps to remove stagnant water, which is a common breeding ground for Aedes mosquitoes, the primary vectors of dengue.

In addition to these environmental efforts, local health authorities have been relentless in urging the public to take personal preventative measures, especially in their homes. Preventive actions include wearing protective clothing, using mosquito repellents, and ensuring that households have adequate screens on windows and doors to keep mosquitoes at bay. The public is also encouraged to empty, cover, or treat any containers that collect and store water, as these can easily become breeding sites for mosquitoes.

The Dengue Fever Vaccines: A Vital Tool in the Fight

In the fight against dengue fever, vaccination is an essential component of prevention. Two vaccines, Dengvaxia and Qdenga, are available to mitigate the risk of dengue infection. However, it’s crucial to note that these vaccines are primarily recommended for individuals with a history of dengue infection and those living in areas with a high dengue fever burden.

The primary goal of these vaccines is to reduce the severity of dengue symptoms and lower the risk of severe complications. Vaccination is not a silver bullet, and it should be complemented by other preventive measures, such as those mentioned earlier.

Recognizing and Managing Dengue Fever Symptoms

Dengue fever is characterized by a sudden onset of fever, usually accompanied by at least one of the following symptoms: severe headache, severe pain behind the eyes, muscle and joint pain, rash, easy bruising, and nose or gum bleeding. These symptoms generally appear within 5-7 days after being bitten by an infected mosquito but can manifest up to 10 days after exposure.

It is vital for individuals to recognize these symptoms, especially if they have recently been in affected areas. Early diagnosis and prompt medical attention are crucial in managing dengue fever effectively. Notably, dengue fever can progress to a more severe form known as dengue hemorrhagic fever (DHF), which can be fatal if not promptly recognized and treated.

The Role of the Public

The role of the public in mitigating the dengue fever outbreak cannot be understated. Every individual has a responsibility to protect themselves and their communities from this disease. This includes reducing mosquito exposure, removing stagnant water sources, and promptly seeking medical attention if symptoms develop.

Importantly, individuals should avoid using aspirin or ibuprofen products if dengue fever is suspected. These medications can exacerbate bleeding tendencies associated with the disease and should be avoided to prevent complications.


The escalating dengue fever outbreak in Hanoi is a stark reminder of the persistent threat this disease poses to Vietnam. The increasing number of cases and the widespread distribution of the virus are concerning trends that demand immediate attention. Through a combination of vaccination, community-based prevention efforts, and proactive individual responsibility, it is possible to mitigate the impact of dengue fever and protect the health and well-being of the population. It is imperative for authorities, healthcare professionals, and the public to unite in their efforts to combat this public health crisis effectively and minimize its toll on the community.


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