Dengue hemorrhagic fever (DHF) is a serious complication of dengue hemorrhagic fever caused by the dengue virus. It is a common infectious disease that is transmitted from person to person by the Aedes mosquito.

Here are some symptoms and signs of the infectious syndrome of dengue fever:

1. Occurrence of bleeding: Patients may experience bleeding symptoms, including bleeding from the nose, mouth, digestive mucosa, or respiratory mucosa. They may also experience bleeding under the skin, internal bleeding, or gastrointestinal bleeding.

2. Sudden decline in platelets: Patients may see a decrease in the number of platelets in the blood, leading to anemia and bleeding easily.

3. Intensification of fever symptoms: High and prolonged fever is a main symptom of dengue fever. In the case of an infectious syndrome, the fever usually lasts longer and may be associated with other symptoms.

4. Blood pressure instability: Patients may experience unstable blood pressure conditions, including hypotension or hypertension.

5. Organ failure: In severe cases, sepsis can cause organ failure, including liver failure, kidney failure or heart failure.

To prevent the infectious syndrome of dengue fever, the following measures should be taken:

1. Mosquito control: It continues to be important to control mosquitoes and destroy their breeding sites to reduce the spread of Dengue virus.

2. Prevent mosquito bites: Wear ao dai and use anti-mosquito cream, protect the skin from mosquito bites.

3. Eliminate mosquito habitats and breeding sites: Make sure there is no standing water in flower pots, water tanks, manholes or any other objects that can hold water and where mosquitoes can breed.

4. Strengthen community education: Strengthen community education about dengue fever, how to prevent it, and awareness of symptoms and points to note.

5. Treatment and medical care: Patients suspected of having dengue fever should be taken to hospital and receive appropriate medical care. Hospital treatment includes keeping water balance

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