Laos: Elevated dengue fever activity reported nationwide, especially Oudomxay Province, through July /update 2

Dengue fever

Elevated dengue fever activity reported nationwide in Laos through July. Oudomxay Province is most affected. Avoid mosquito bites.


Health authorities have reported elevated dengue fever activity nationwide in Laos, with an additional 3,790 cases reported from June 14-July 4, bringing the total to 7,885 cases since Jan. 1. This is 1.3 times higher than the 6,047 cases reported over a similar period in 2022. Oudomxay (1,669 cases) is the most affected province, followed by Khammouane (1,291 cases), Xayaboury (707 cases), Louang Phrabang (586 cases), Savannakhet (586 cases), and Vientiane (574 cases). The Lao Ministry of Health has urged residents to implement preventative measures, such as clearing potential mosquito breeding sites around homes and workplaces to curb disease transmission. Health officials also urge anyone that is experiencing symptoms to seek immediate medical treatment. This represents the most complete information available as of July 10.


Dengue fever is a nationwide, year-round threat in Laos; however, the risk is typically highest in May-September during the monsoon season. Laos reported roughly 32,364 dengue fever cases nationwide in 2022, approximately 1,400 cases in 2021, and approximately 7,700 cases in 2020.

A dengue fever vaccine is available in some countries. It is only recommended for individuals with a history of dengue infection and in countries with high dengue fever burdens. Dengue fever is transmitted through the bite of an infected mosquito. 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 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.


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