Macau | Mosquito density remains high in July

Macau (MNA) – The Mosquito Propagation Index (‘Ovitrap’) reached 65.1 per cent in July, according to a release by the Health Bureau (SS) on Thursday, in which the Bureau stated the rate is similar to that registered in the month of July since 2002.

Ovitrap is a vector surveillance mechanism which measures the number of mosquito egg clusters.

More commonly, the index is used to surveil and monitor Aedes aegypti density, determining factors related to dengue transmission, in order to prioritise areas and seasons for vector control, according to the World Health Organisation (WHO).

The highest number of mosquito eggs were concentrated in Coloane Village, which recorded 79.8 per cent.

According to July’s readings, the highest number of mosquito eggs on the Macau Peninsula were concentrated in the Areia Preta district (70.8 per cent) and in the St. Lawrence district (70.7 per cent).

The SS has been contacted for clarification on what the index levels indicate, with a representative indicating that the level is high, and similar to the indicators from Hong Kong.

Macau News Agency (MNA) has therefore, taken indicators from the Hong Kong Food and Environmental Hygiene Department, which recommends that special operations such as private pest control contractors be engaged once the ovitrap index exceeds 40 per cent.

In addition, since the weather is hot, the SS advises that residents be mindful of dengue symptoms, especially when travelling to places in Southeast Asia which are a hotbed for Aedes mosquitoes.

In order to prevent the breeding of Aedes mosquitoes, the SS claims it has monitored the number of mosquito eggs since 2002, having installed some 860 Ovitrap surveillance mechanisms in the city, allowing for monthly collection of data and thus monitoring.