SSM preps for peak mosquito season

As the territory enters its peak mosquito season, the risk of individual cases or community outbreaks from Aedes albopictus mosquitoes, which transmit diseases like dengue, will gradually increase. The Health Bureau’s (SSM) chemical mosquito control operations will increase to at least twice monthly starting next month, then to three times in high-risk areas from July.

At a press conference yesterday, Ma Cheng Wan, senior technician at the SSM’s Centre for Disease Prevention and Control, said: “The risk cannot be ignored, as Aedes albopictus mosquitoes generally reach their peak in April.”

“We expect the index to rise significantly in April, and the risk of individual cases or community outbreaks will gradually increase,” she added.

Kwok Kei Leong, another technician at the centre, recommended that residents install 20-mesh screens for optimal protection. “For sufficient mosquito protection, we generally recommend a 20-mesh screen […] screen mesh comes in various materials, including nylon, polyester, fiberglass, and even stainless steel, depending on the needs of different homes,” he said.

Bureau staff demonstrated user-friendly options, including Velcro screens made with rubber strips glued to window frames and cotton mesh, as well as magnetic versions that self-seal via magnetic strips for easy removal. Velcro models work well for quick installations, but Kwok warned that these Velcro models have “relatively ordinary” density and are “prone to heat and aging after prolonged use.”

Other preventive measures discussed by SSM include using safe and effective insect repellent. The health technicians recommended WHO-approved insect repellents containing icaridin or picaridin, applied to exposed skin or clothing, along with light-colored long-sleeved shirts to prevent bites. Authorities also emphasize clearing stagnant water, installing window screens, and avoiding heatstroke risks.

“Residents should remember to see a doctor as soon as possible if they experience symptoms such as inflammation, muscle and joint pain, or rashes,” Ma said, urging patients to share recent travel history with doctors in these cases.

This weekend, 10 “Community Consultation Stations for the Prevention of Mosquito-borne Infectious Diseases” will open across Macau to provide prevention advice.