Taiwan: Elevated dengue fever activity reported across multiple areas through early October /update 3

Event

Taiwanese health authorities continue to report elevated dengue fever activity across multiple areas, with an additional 6,158 cases reported Sept. 5-23, bringing the total to 10,496 cases since May 29. Only 56 cases were reported over a similar period in 2022. The most at-risk area is Tainan City (9,463 cases) accounting for 90 percent of the total case count, followed by Yunlin Municipality, Kaohsiung City, and Pingtung County. This represents the most complete information available as of Oct. 2.

Context

Dengue fever is a nationwide risk in Taiwan, with transmission typically highest May-August during the rainy season. Taiwan reported 85 dengue fever cases nationwide in 2022, approximately 10 cases in 2021, and 137 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.

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.