Hong Kong's Centre for Health Protection reported four imported dengue fever cases between October 23 and October 29, 2026. Three patients had visited Vietnam and one had visited Malaysia and Singapore during the incubation period. The city has recorded 40 dengue cases so far this year, made up of 38 imported and two local cases, against 59 all-imported cases in 2025 and 161 cases in 2024, including five local.

Globally, the World Health Organization logged over 14 million dengue cases in 2024, a record. In 2025 it reported over 5 million cases and over 4,000 related deaths across more than 90 countries or territories; from January to September 2026 it recorded around 2.5 million cases and over 1,500 deaths. Several regional destinations have each recorded more than 100,000 cases this year, and Guangdong Province reported 586 cases as of September.

One imported chikungunya case was also recorded in the same period, involving a 44-year-old woman who had visited the Chinese Mainland during the incubation period. She was treated in a mosquito-free environment and discharged; the investigation continues. Hong Kong has recorded eight confirmed chikungunya cases this year: seven imported and one local.

The CHP and the Food and Environmental Hygiene Department urged the public to remove standing water and use insect repellent, and to check conditions at destinations before travelling.