Plasmodium vivax
Plasmodium vivax is a protozoal parasite and a human pathogen. This parasite is the most frequent and widely distributed cause of recurring (Benign tertian) malaria, "P. vivax" is one of the five species of malaria parasites that commonly infect humans. Although it is less virulent than "Plasmodium falciparum", the deadliest of the five human malaria parasites, "P. vivax" malaria infections can lead to severe disease and death, often due to splenomegaly (a pathologically enlarged spleen). "P. vivax" is carried by the female "Anopheles" mosquito; the males do not bite.
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.