Rising temperatures and seasonal rainfall across China have prompted local authorities to intensify efforts to control mosquito populations and prevent outbreaks of dengue and chikungunya, health officials said. Both viral diseases are transmitted by the Aedes mosquito, identifiable by its black and white stripes, which thrive under such climatic conditions.

In a statement issued Tuesday, officials in Maoming, Guangdong province, urged residents to eliminate stagnant water, avoid mosquito bites, and promptly seek medical care if they experience symptoms such as fever or joint pain. The mosquitoes breed in minimal amounts of clean, standing water, including water collected in common household containers like flower vases and plant trays. These insects are primarily active during daylight hours, with peak activity occurring one to two hours before and after sunrise and two to three hours before sunset.

Authorities emphasized that removing mosquito breeding sites is a crucial preventive measure. Even small water deposits, such as those the size of a bottle cap, can support mosquito reproduction. Residents were advised to regularly inspect their surroundings, empty water containers, and scrub the inside surfaces of these items. Additional recommendations included using window screens and bed nets indoors, employing electric repellents in air-conditioned rooms, and wearing long-sleeved, light-colored clothing alongside topical repellents during periods of peak mosquito activity outdoors.

Beijing has initiated a comprehensive three-year project to establish mosquito-hazard-free zones, starting this year with six central districts and 13 municipal parks. The goal is to certify 80% of the city’s communities, parks, and public facilities as free of mosquito risks by 2028.

Experts caution that prevention alone is insufficient. Yuan Jun, deputy director of the Guangzhou Center for Disease Control and Prevention, highlighted the importance of patients seeking prompt medical treatment. He noted that individuals infected with dengue are highly contagious during the initial five days of illness, while those with chikungunya remain infectious for about seven days after symptoms emerge. Patients should take precautions to avoid being bitten by mosquitoes to prevent further transmission, including sleeping under bed nets.

Yuan also warned that dengue can become severe in vulnerable groups such as the elderly, pregnant women, and those with preexisting health conditions, potentially leading to complications like severe bleeding, shock, or organ failure. In chikungunya cases, debilitating joint pain can persist for months or even years, resulting in long-term impairment.

Additional insights from Zhou Xiaojie of the Beijing Center for Disease Prevention and Control underscored that mosquito attraction varies among individuals. Factors such as higher carbon dioxide exhalation—common in those who have exercised recently or are obese—along with heavy sweating, youthful metabolic rates, and the consumption of sugary substances or beer, can increase the likelihood of being bitten.

As climate conditions continue to facilitate mosquito proliferation, authorities and public health experts underscore the importance of vigilant community action and timely medical response to mitigate the public health risks posed by dengue and chikungunya.