The CDC announced today (the 18th) a new locally transmitted dengue case, a male in his 30s residing in Changhua City, Changhua County. In early September he sought medical care for fever, but symptoms did not improve, so he returned to the emergency department. After reporting and testing, he was confirmed infected with dengue on September 17, with dengue virus serotype 1 detected. The patient is currently hospitalized, and close contacts have no suspected symptoms.
The CDC said the case's incubation period activities were mainly at his home and workplace in Changhua County, with additional activity history in neighboring counties, and no overseas travel history, thus judged as a local case, with the source of infection pending clarification. Relevant health authorities have carried out emergency chemical control, vector mosquito density surveys, and environmental risk assessments around the case's residence or activity areas, and have strengthened source elimination and health education, urging the public to implement mosquito prevention measures and cooperate with control efforts. If fever, headache, retro‑orbital pain, muscle or joint pain, rash or other suspected dengue symptoms appear, seek medical care promptly and inform the physician of travel and activity history.
CDC surveillance data show that nationwide, as of September 17, 2026, there have been a cumulative 168 confirmed dengue cases this year, including 11 local cases (10 in Kaohsiung City and 1 in Changhua County); the remaining 157 are imported cases, mainly from Vietnam (38), Indonesia (28), the Philippines (20) and other Southeast and South Asian countries, a total lower than the same period in 2025 (173). Internationally, the global dengue situation continues; up to August this year more than 2.22 million cases have been reported, with most cases in the Americas such as Brazil. In neighboring Asian countries, Vietnam, Malaysia, Bangladesh, the Philippines, and Cambodia are seeing rising or peak levels, generally higher than the same period last year; Vietnam has reported over 100,000 cases so far this year, Malaysia about 70,000, and Sri Lanka nearly 100,000, far above the five‑year average.
The CDC reminds that recent temperatures are favorable for mosquito activity and breeding. The public should continue the “inspect, overturn, clean, scrub” routine, actively eliminate breeding sites indoors and outdoors to prevent vector mosquitoes from proliferating; when outdoors, wear light‑colored long‑sleeved clothing and use government‑approved repellents containing DEET, Picaridin, or IR‑3535. If fever, headache, retro‑orbital pain, muscle or joint pain, rash or other suspected dengue symptoms appear, seek medical care promptly and inform of travel and activity history. Medical facilities should also stay vigilant, intensify questioning of patients' TOCC (travel, occupation, contact, cluster history), and may use dengue NS1 rapid test kits to aid early diagnosis and reporting, enabling health authorities to implement control measures early. For dengue information, visit the CDC’s global website ( https://www.cdc.gov.tw) or call the toll‑free epidemic prevention line 1922 (0800‑001922).https://www.cdc.gov.tw) for reference, or call the toll‑free epidemic prevention line 1922 (0800-001922) for inquiries.
Source: CDC
Data compiled: Infection Control Office
