Vietnam: Elevated dengue fever activity reported nationwide during 2022

Event

Vietnamese officials report ongoing elevated dengue fever activity during 2022, with 77,000 cases identified Jan. 1-June 24. This case count is significantly higher than the activity reported during the same period of 2021, when roughly 35,000 cases were reported. Most cases were reported in central and southern provinces, with Ho Chi Minh City most affected (16,057 cases). This report represents the most complete information available as of June 29.

Context

Dengue fever is a nationwide and year-round threat in Vietnam, but the threat of infection is typically highest during and immediately following the rainy season, which occurs May-October in the north, June-November in the south, and September-December in central coastal areas. Vietnam reported roughly 71,000 cases of dengue fever in 2021 and over 133,000 cases during 2020.

A dengue fever vaccine is available in some countries. It is only recommended for individuals with a history of dengue infection and in a country with high dengue fever burden. Symptoms of dengue fever include a sudden onset of fever and at least one of the following: a severe headache, severe pain behind the eyes, muscle and/or joint pain, rash, easy bruising, and/or nose or gum bleeding. Symptoms typically appear 5-7 days after being bitten but can develop up to 10 days after exposure. Dengue fever can progress to a more severe form known as dengue hemorrhagic fever (DHF). DHF can be fatal if it is not recognized and treated promptly.

Advice

If you have previously been infected with dengue fever, consult with your physician regarding vaccination. Avoid mosquito bites and remove standing water to reduce the number of biting mosquitoes. Seek medical attention if symptoms develop within two weeks of being in affected areas. Do not use aspirin or ibuprofen products if dengue fever is suspected, as these could exacerbate bleeding tendencies associated with the disease.