Mosquito
Mosquito-borne diseases are currently most prevalent in East Africa, Latin America,  Southeast Asia, and India; however, emergence of vector-borne diseases in Europe have recently been observed. A weighted risk analysis demonstrated associations to climate for 49% of infectious diseases in Europe including all transmission routes. One statistical model predicts by 2030, the climate of southern Great Britain will be climatically-suitable for malaria transmission "Plasmodium vivax" malaria for 2 months of the year. By 2080 it is predicted that the same will be true for southern Scotland.
John Augustus Abayomi-Cole
At the turn of the century, malaria was the greatest scourge of West Africa, and was taking a deadly toll particularly of Europeans living in West Africa. Dr. Abayomi-Cole was called upon by the Colonial Government to help combat the disease. He made an effective preparation of herbs, containing as its main ingredients "broomstone" leaves and "agiri". But he found that his cured patients returned within a few weeks with the same symptoms. Through intensive research, he was able to establish that poor environmental sanitation was the root cause of the relapse — mosquitoes were breeding in stagnant pools of water around houses. He organised groups of voluntary workers known as "mosquito missionaries" who went from compound to compound advising people on the necessity of keeping their living areas clean. The scheme worked so well that the Colonial Government later paid the volunteers monthly.