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.
Josiah C. Nott
Nott took up theories that the mosquito was a vector for malaria, held by John Crawford and his contemporary Lewis Daniel Beauperthy. He is credited as being the first to apply the insect vector theory to yellow fever, then a serious health problem of the American South. In his 1850 "Yellow Fever Contrasted with Bilious Fever" he attacked the prevailing miasma theory. Nott lost four of his children to yellow fever in one week in September 1853.