Hong Kong Reports No New Chikungunya Fever Cases Amid Ongoing Mosquito Control Efforts

Update on chikungunya fever

The Centre for Health Protection (CHP) of the Department of Health announced that, as of 5pm today (January 7), no new cases of chikungunya fever (CF) had been recorded.

Latest surveillance data

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Hong Kong has recorded a total of 82 confirmed CF cases last year. Among them, 11 were local cases, and the rest were imported cases.

Since the beginning of 2025, and as of December 10, 2025, a total of 502 264 CF cases and 186 CF-related deaths have been reported in over 40 countries/territories. Cases have been reported in the Americas, Africa, Asia, and Europe. Although the northern hemisphere has entered the winter season, temperatures in subtropical and some temperate regions remain elevated due to climate change, creating favourable conditions for mosquito breeding. In addition, CF outbreaks continue to occur in many countries worldwide. The risk of imported cases persists. Members of the public should check the situation of the destinations before travelling abroad, especially when travelling to Southeast Asian countries.

Government's comprehensive follow-up actions

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Given that some local cases of CF have visited the Tsing Yi Nature Trails or the surrounding area in November last year, the trails are currently closed until further notice. Relevant government departments continue to conduct large-scale mosquito control and prevention efforts along the trails, and the CHP appeals to the public not to enter the area in order to reduce the risk of contracting CF and to avoid exposure to chemicals or interfering with the mosquito control operations. Since the confirmation on December 10, 2025, of a case involving a person who had visited the Tsing Yi Nature Trails on November 30, 2025, no further local cases have been recorded to date. The CHP continues to urge individuals who have recently hiked along the Tsing Yi Nature Trails to seek medical attention as soon as possible if they develop relevant symptoms and to call the enquiry hotline (Tel: 2125 2373), which operates from 9am to 6pm.

The Food and Environmental Hygiene Department (FEHD) has been continuously conducting intensive fogging operations to eliminate adult mosquitoes along the Tsing Yi Nature Trails and the surrounding area. At suitable locations, large ultra-low volume foggers have been deployed, and a robot dog is being put on trial to enhance operational effectiveness. The FEHD has also set up new mosquito trapping devices, cleared discarded containers and garbage that could cause stagnant water, and applied larvicide oil or larvicides in areas with stagnant water that cannot be removed immediately. The FEHD has been collaborating with the Kwai Tsing District Office, the Lands Department and the Drainage Services Department to strengthen efforts in eliminating potential mosquito breeding sites along the Tsing Yi Nature Trails. Pamphlets have been distributed to hikers in the area, urging citizens to be vigilant against mosquito infestations and take personal protective measures. The FEHD has also held meetings of the interdepartmental task forces on anti-mosquito work across districts to discuss the latest developments regarding the situation and plan accordingly to co-ordinate relevant departments and stakeholders in strengthening mosquito prevention and control measures in areas under their purview.

Continuously strengthening prevention and control

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The FEHD and relevant departments have comprehensively enhanced the mosquito control operations in Hong Kong since July last year, and this has continued. Among these, the FEHD has conducted vector investigations and targeted mosquito control operations against the imported and local cases. In light of the local case, the FEHD has immediately conducted follow-up actions, including:

• carrying out intensive fogging in scrubby areas within a 250-metre radius of the relevant locations to kill adult mosquitoes;

• carrying out inspections of the locations, removing stagnant water, applying insecticides and disposing of abandoned water containers every week with a view to preventing mosquito breeding; and

• enhancing public education efforts through organising health talks, setting up mobile education stations, and distributing publicity leaflets.

The abovementioned measures will be continued. Furthermore, the Government will further enhance the mosquito control efforts in addition to the existing measures.

Preventive measures to be taken by the public

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Members of the public should use DEET-containing insect repellents or other effective active ingredients properly to prevent mosquito bites, but the following precautions should be taken when using them:

• read the label instructions carefully first;

• apply right before entering an area with a risk of mosquito bites;

• apply on exposed skin and clothing;

• use DEET of up to 30 per cent for pregnant women and up to 10 per cent for children (for children who travel to countries or areas where mosquito-borne diseases are endemic or epidemic and where exposure is likely, those aged 2 months or above can use DEET-containing insect repellents with a DEET concentration of up to 30 per cent);

• apply sunscreen first, then insect repellent;

• reapply only when needed and follow the instructions; and

• in addition to DEET, there are other insect repellents available on the market containing different active ingredients, such as IR3535 and picaridin. When using any insect repellent, the public should follow the usage instructions and precautions on the product label.

The FEHD also appeals to members of the public to continue to stay alert and work together to carry out mosquito prevention and control measures early, including inspecting their homes and surroundings to remove potential breeding grounds, changing water in vases and scrubbing their inner surfaces, removing water in saucers under potted plants at least once a week, and properly disposing of containers such as empty cans and lunch boxes. The FEHD also advises members of the public and property management agencies to keep drains free of blockage and level all defective ground surfaces to prevent the accumulation of water. They should also scrub all drains and surface sewers with an alkaline detergent at least once a week to remove any mosquito eggs.

The public should call 1823 in case of mosquito problems, and may visit the following pages for more information: the CF page of the CHP and the Travel Health Service, the latest Travel Health News, tips for using insect repellents, and the CHP Facebook Page, Instagram Account and YouTube Channel, and also the Mosquito Prevention and Control dedicated page of the FEHD.

The Centre for Health Protection (CHP), Photo source: reference image

CEDD commended by Ombudsman on slope safety work

Regarding the report on the direct investigation into the Government's work on landslide prevention and mitigation and management of government slopes released by the Office of the Ombudsman today (January 8), the Civil Engineering and Development Department (CEDD) welcomed the Office's high commendation and recognition of the department's efforts in implementing the Landslip Prevention and Mitigation Programme (LPMitP) and regulating slope safety. The CEDD accepts the Office's recommendations and will fully implement various initiatives while continuously reviewing their effectiveness. In response to the Office's recommendations, the CEDD will continue to strengthen its overall capability in responding to landslide risks in four areas, namely preparedness, early warning, emergency response and recovery, to keep enhancing slope safety.

On preparedness, applying a risk-based approach under the LPMitP, the CEDD systematically selects government man-made slopes for upgrading works and natural hillside catchments for mitigation measures annually. Starting from 2025, the CEDD has been progressively increasing the annual targets under the LPMitP and optimising the slope selection mechanism to strengthen resilience of slopes to heavy rain. The CEDD will review the LPMitP's targets and effectiveness in response to environmental changes, ensuring the LPMitP's continued efficacy.

The CEDD plans to fully roll out the Smart Slope Catalogue this year, integrating records of mitigation works, maintenance, rainfall endured, and landslides to expand comprehensive monitoring and data management related to slopes. By applying artificial intelligence for big data analysis, the catalogue will improve the functionality and efficiency of slope safety management, thereby better preparing for extreme weather.

On early warning, the CEDD will fully commission the AI Landslip Warning System in the wet season of this year. The system integrates Hong Kong's rainfall data and information in the Smart Slope Catalogue, and applies machine learning and big data analytics, to boost the accuracy of the predicted number of landslides during heavy rain, thereby enhancing the capability for landslide risk assessment and improving the reliability of the issuance of Landslip Warning.

On emergency response and recovery, the CEDD will stay abreast of the technological advancements in slope safety, and developing and introducing innovative technologies. This includes piloting applications of a smart unmanned drone management system on slope monitoring and emergency management to expand data collection and analytics capabilities. The CEDD will also continue to strengthen collaboration with relevant departments, such as sharing on common maintenance issues and assessment of the impact of heavy rain on slopes, with a view to enhancing slope safety and reducing landslide risk.

The Office noted that the landslide incident rate for government slopes is relatively higher and that there are cases of repeated occurrences. In fact, this is mainly related to the categorisation of slopes and their potential impact, reflecting the government's risk-based approach to slope management. The man-made slopes maintained by the government are distributed over an extensive area, possess diversified nature, and have different levels of risks. These include slopes with relatively high, medium, and relatively low potential impacts, categorised mainly by the risk of loss of life in the event of a landslide. To ensure public safety, the government will prioritise landslide prevention works on slopes that pose a higher potential impact. Some of the government slopes that fall into medium or relatively low potential impact categories may not be accorded priority because of their relatively remote locations or a lower risk of loss of life. As such, those government slopes with medium and relatively low potential impacts may also experience landslides under a risk-controlled condition. On the contrary, private man-made slopes are more similar in nature. Most of them are close to private residences and would pose greater impact on the residents in the event of a landslide. They are generally categorised as having relatively high potential impact and receive a higher level of attention. This explains why the overall landslide incident rate for government slopes appears higher, and why landslides may occur repeatedly on some individual slopes with medium or relatively low potential impacts.

In fact, between 2020 and 2024, the annual landslide incident rates for both government and private man-made slopes remained below one per cent (ranging from 0.1 per cent to 0.6 per cent for government slopes and 0.03 per cent to 0.3 per cent for private slopes), which is a very low level. Overall, an average of about 214 incidents were recorded annually over the past decade (2015 to 2024), representing a decrease of nearly one-third compared to the average of about 300 incidents between 1989 and 2014. This reflects the notable results achieved through the ongoing prevention and mitigation efforts.

In response to the landslide incidents triggered by the extreme rainstorm in September 2023, the CEDD has completed a systematic review and study, putting forward a number of recommendations to optimise the LPMitP. New measures include expediting the progress of LPMitP and prioritising, under a risk-based approach, the risk management of man-made slopes located along sole vehicular accesses and those with a greater potential impact on the public's daily lives. The CEDD thanks the Ombudsman for recognising in its report the department's timely review and adjustment of the direction of the LPMitP, acknowledging that such an approach is proactive and effective in adapting to changing circumstances.

The CEDD will continue to closely monitor slope safety in Hong Kong and remains committed to enhancing slope safety management through collaboration, driving Hong Kong's development as a resilient and livable world-class city.

Source: AI-found images