The monthly average ovitrap index for April surged to 7.6% from 1.4% in March, with Fanling falling into the alert zone of 20-40%, the Food & Environmental Hygiene Department says.

The ovitrap indices reflect the prevalence of Aedes albopictus, the mosquito vector for Dengue fever transmission. Of the 38 areas surveyed last month, positive ovitrap indices ranging 1.7-25.5% were recorded in 35 areas. The index for port areas rose from 0.3% in March to 0.9%.

Fanling saw the highest index of 25.5%. The inter-departmental anti-mosquito response mechanism has been activated in the district. Government departments have stepped up inspections and efforts to enhance environmental hygiene and eliminate mosquito-breeding grounds.

The public should maintain proper anti-mosquito measures and stay alert to the risk of mosquito-transmitted disease during the rainy season. More information on the ovitrap indices and anti-mosquito measures can be found here, or call 2868 0000.

For information and health advice on Dengue fever, click here or call the Department of Health's hotline 2833 0111.