Issue No. 425 – Dengue Fever Cases on the Rise: Public Urged to Stay Alert

A total of 8 new local cases of dengue fever were reported last week. To prevent further spread, the public is strongly urged to implement the “Inspect, Empty, Clean, and Scrub” measures to eliminate mosquito breeding sites. If you experience any suspected symptoms, please seek medical attention immediately.

Taiwan CDC Reports 8 New Local Dengue Fever Cases Last Week (Aug. 26–Sep. 1)

The Taiwan Centers for Disease Control (hereinafter referred to as “Taiwan CDC”) announced today (September 2) that 8 new locally transmitted dengue fever cases were confirmed in Taiwan during the past week (August 26 to September 1).

Six of the cases were part of a cluster infection in Gushan .District, Kaohsiung City, with symptom onset dates ranging from August 25 toAugust 28.

The remaining two cases were residents of Sanmin District, Kaohsiung City. The index case developed symptoms including fever, headache, and muscle pain on August 28, sought medical attention and was tested on August 29, and was later confirmed to be infected with dengue virus serotype 2. The second case, a household member of the index case, was tested on August 31 and also confirmed to have dengue virus serotype 2. This incident has been determined to be a family cluster. As neither of the two individuals had a recent travel history abroad or visited Gushan District, the source of infection remains under investigation.

Health authorities continue to carry out source reduction and vector control measures in and around the residences and workplaces of the confirmed cases.

Taiwan CDC Reports Cumulative Dengue Fever Cases as of September 1, 2025

According to the Taiwan Centers for Disease Control (Taiwan CDC), as of September 1, 2025, a total of 12 locally transmitted dengue fever cases have been confirmed this year. All cases reside in Kaohsiung City, and no severe cases or deaths have been reported.

Additionally, a total of 155 imported dengue fever cases have been confirmed, making it the second highest for the same period in the past six years (ranging between 7 and 193 cases). The majority of imported cases originated from Southeast Asian countries, with Indonesia accounting for the highest number (53 cases), followed by Vietnam (35 cases), and the Philippines and Thailand (18 cases each).

Globally, over 3.94 million dengue fever cases have been reported so far this year, primarily in the Americas. Brazil, Colombia, and Mexico have reported the highest number of cases in the region. In Asia, increasing case numbers have been observed in Vietnam, Thailand, Bangladesh, the Philippines, Laos, India, and China. Malaysia continues to experience sustained transmission, while Sri Lanka has also reported higher case numbers compared to the same period last year. In the Pacific region, Samoa has also seen a rise in dengue activity.

Taiwan CDC Reminds the Public to Stay Vigilant During Dengue Fever Season

The Taiwan Centers for Disease Control (Taiwan CDC) reminds the public that Taiwan is currently in the peak season for dengue fever. Recent weather patterns, featuring hot and humid conditions with frequent afternoon showers, provide a favorable environment for mosquito breeding and virus transmission.

The public is urged to thoroughly clean and maintain their surroundings—both indoors and outdoors—by eliminating any potential mosquito breeding sites. It is especially important to conduct inspections after rainfall to reduce the density of vector mosquitoes.

When engaging in outdoor activities, individuals are advised to wear light-colored, long-sleeved clothing and use mosquito repellents containing effective ingredients approved by health authorities, such as DEET, Picaridin, or IR-3535.

If you develop symptoms such as fever, headache, pain behind the eyes, muscle and joint pain, or skin rash, please seek medical attention promptly and inform your doctor of any recent travel or activity history.

As the new school term begins, teachers and students are also reminded to inspect campus environments. Any water-holding containers should be emptied and removed to prevent mosquito breeding in school settings.

Taiwan CDC Urges Healthcare Facilities to Remain Vigilant and Enhance Case Detection for Dengue Fever

The Taiwan Centers for Disease Control (Taiwan CDC) urges all healthcare facilities to remain vigilant and enhance their screening procedures by thoroughly inquiring about patients’ TOCC history—Travel, Occupation, Contact, and Cluster. Physicians are encouraged to make timely use of the dengue NS1 rapid diagnostic test to assist with early diagnosis and case reporting, enabling public health authorities to implement necessary control measures as early as possible.

For more information on dengue fever, please visit the Taiwan CDC’s official website: https://www.cdc.gov.tw

, or contact the toll-free Communicable Disease 

Data Source: Taiwan Centers for Disease Control (Taiwan CDC)