DDT, also known as DDT and 223, was first synthesized and separated in the 19th century. However, it was not until World War II that Swiss chemist Paul Muller first realized that DDT was a highly effective insect nerve agent. This discovery made a historic contribution to prevent the spread of infectious diseases such as malaria in the military during wartime, and Mill also won the Nobel Prize in Physiology in 1948.

people who have tasted the sweetness begin to use DDT in large quantities to fight mosquitoes and flies that plague their lives and pests in farmland. In the middle of last century, the World Health Organization (WHO) launched a worldwide campaign to eliminate malaria. As a first-class soldier, DDT made outstanding contributions. In Taiwan Province, the Balkans, parts of North America and many parts of the South Pacific, the epidemic scope of malaria has been reduced, and the mortality rates in Sri Lanka and India have been successfully reduced. At that time, many countries * * * issued stamps with the theme of spraying DDT, which echoed the fact that DDT inventors put on the scientific laurel, making people all over the world applaud DDT as a great scientific achievement.

Africa and some Latin American countries are located near the equator, and the weather is hot and humid, which is very suitable for mosquito and fly breeding. In addition, these countries have long been poor and have poor sanitary conditions, so mosquito-borne diseases are a major security threat. According to the latest official data about malaria published by the World Malaria Foundation (MFI), in 26, there were about 2.47 billion people infected with malaria and 3.3 billion people threatened by malaria, of which 86% were in African countries, and the rest were in Asian countries such as India, Sudan and Bangladesh.

this is the reason for the reboot.