For the first time, the city issued the "Mosquito Bites Index" to
forecast the density of mosquitoes in the next 3 days and put forward protective measures
News from our newspaper (reporter Jiang Ruojing) Yesterday, the Beijing Municipal Center for Disease Control and Prevention and the Beijing Municipal Meteorological Service Center jointly released Beijing’s "Mosquito Biting Index" (MBI) for the first time, dividing the mosquito density into five levels for the next three days. And put forward corresponding protective measures.
The index is released in 16 districts in Beijing, and the release period is from June 1st to September 30th each year. The specific time is to roll out the daily "mosquito bite index" forecast for the next three days around 11 o'clock every day.
It is understood that in order to better predict and forecast mosquito hazards, the Beijing Municipal Center for Disease Control and Prevention and the Beijing Meteorological Service Center have carried out joint scientific research in July 2019, using monitoring big data to establish a model, combined with multidisciplinary expert consultation , Forming a prediction and forecasting mechanism.
Yesterday, Beijing’s “Mosquito Biting Index” (MBI) was released for the first time, realizing the transformation of mosquito density from “active monitoring” to “timely forecasting”.
It is understood that the Beijing Municipal Center for Disease Control and Prevention is responsible for organizing and implementing the city’s mosquito density and hazard monitoring. Since the city’s innovative use of the "carbon dioxide trap method" for mosquito density monitoring in 2008, it has significantly improved the sensitivity of mosquito density monitoring. And accuracy.
The "Mosquito Bite Index" is based on the mosquito density data of the districts in Beijing for more than ten years, and it analyzes the changes of mosquito density in a long time series in detail.
At the same time, the density of mosquitoes is closely related to meteorological factors such as temperature, humidity, rainfall, wind speed, accumulated temperature, temperature and rain index.
Based on previous research and experiments, Beijing Meteorological Service Center used mosquito monitoring and meteorological observation data for more than ten years as training samples. By comparing the prediction effects of mosquito density, it made predictions based on the average results of five established algorithm models.
The two units researched and determined the city’s “mosquito bite index” classification index: the risk of mosquito bites in Beijing was divided into five levels: low, low, medium, high, and high for forecasting, and based on this, the corresponding levels were proposed. Personal protection recommendations for the public to provide the public with mosquito hazard risk forecasts.
The "mosquito bite index" is published in 16 districts in Beijing. The publication period is from June 1 to September 30 each year. The specific time is to roll out the daily "mosquito bite index" forecast for the next three days at around 11 o'clock every day.
The index release platform is Beijing Meteorological Beijing Weibo and WeChat official account, Beijing Pollen Monitoring and Forecast WeChat official account, Beijing Center for Disease Control and Prevention official website and WeChat official account, etc. The peak of mosquito density is in the "Weather Forecast" column of Beijing Satellite TV Beijing News Increase the content of the mosquito bite index forecast.
dialogue
The index will serve as a reference for citizens' healthy travel
Interviewer: Zhang Yong, Deputy Director, Disinfection and Pest Control Institute, Beijing Center for Disease Control and Prevention
Beijing Youth Daily: This is the first time that Beijing has released the "Mosquito Bites Index". What was the original intention of publishing this index?
Zhang Yong: Beijing conducts mosquito monitoring all the year round. Most of the monitoring results provide technical support for the municipal government to prevent mosquito-borne diseases and mosquito control. However, in fact, ordinary people are also very concerned about mosquito bites.
It is hoped that this index can not only provide decision-making support for the government, but also serve as an early warning reference for citizens' healthy travel.
Beijing Youth Daily: How is the density of mosquitoes monitored?
Zhang Yong: Since 2008, the city has innovatively adopted the "carbon dioxide trap method" for mosquito density monitoring.
The reason why some people recruit mosquitoes, the carbon dioxide gas they exhale and the specific components contained in the sweat secreted on the skin surface are very important factors for attracting mosquitoes.
The amount of carbon dioxide gas released by mosquito traps is equivalent to the amount of carbon dioxide exhaled by an adult, so as to attract mosquitoes, its accuracy and sensitivity will be much higher.
Wherever there are many mosquitoes, place the monitoring points, such as residential areas, parks, and tourist attractions.
There are currently more than 240 monitoring points in the city, including 107 carbon dioxide mosquito traps.
Mosquito density monitoring is carried out from May to October every year, and the monitoring is carried out every 10 days. The mosquito killer lamp is taken back to the laboratory for classification, data statistics and result analysis of mosquitoes.
Beijing Youth Daily: Why does this index incorporate meteorological factors?
Zhang Yong: As we all know, mosquito density is closely related to meteorological factors such as temperature, humidity, rainfall, wind speed, accumulated temperature, temperature and rain index.
Where there is more water, there are more mosquitoes; wherever there is lush vegetation, there are more mosquitoes.
Only after adding these meteorological factors can we better predict mosquito breeding.
In addition to the actual monitoring data of the monitoring points, using more than ten years of mosquito monitoring and meteorological observation data as training samples, a variety of machine learning methods are used to compare the prediction effects of mosquito density, and predictions are based on the average results of the five established algorithm models. .
Thus, like the clothing index and the car wash index in the weather forecast, the risk of mosquito bites can also be forecasted to the citizens in time.
Beiqing Daily: Why did you choose to publish it from June to September?
Zhang Yong: According to monitoring data for many years, mosquitoes in Beijing began to appear in late May. With the increase in temperature, the density of mosquitoes has also increased. It basically reached the highest value in late July and early August, and reached the highest value in late September. Mosquitoes basically disappeared in the external environment.
Therefore, we chose the peak time of mosquito activities to publish, so that the public's attention is higher and the guiding significance is greater.
Beiqing Daily: What are the common mosquitoes in Beijing?
What's the harm?
Zhang Yong: Common mosquitoes in Beijing include Culex pipiens pallens and Aedes albopictus.
Among them, Culex pipiens pallens is the most abundant mosquito species in Beijing.
Its shape is medium, with transparent wings and brown or light brown body color. It mainly breeds in various water bodies containing more organic matter, such as sewage ponds, stinky gutters, rainwater wells, sewers, etc.
It usually occurs in May and reaches the peak of the year from July to August, which can spread a variety of mosquito-borne infectious diseases.
Aedes albopictus is the second most abundant mosquito species. Its morphology is small to medium, commonly known as "flower mosquitoes". The larvae prefer to breed in small water containers, such as discarded household flower pots, paint buckets, and foam boxes.
It is mainly active during the day and is a common mosquito species that can spread dengue fever.
In recent years, Beijing has successively reported imported cases of malaria, dengue fever, and yellow fever, and only a small number of local cases of Japanese encephalitis have occurred.
However, the release of this index is of great significance to Beijing's prevention and control of mosquito-borne infectious diseases, helping citizens prevent mosquito harassment and bites, and improving citizens' quality of life and health.
This release is a brand new attempt. Currently, the city-wide and district indexes are released. In the next step, we will gradually improve and refine the content of the release.
Text/Reporter Jiang Ruojing