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.
Walter Myers (physician)
On 24 August Durham and Myers arrived in Pari (modern day Belem) in the northern state of Pará, Brazil, where they established a laboratory in Domingos Freire Hospital to study the transmission of the disease and were among the first to establish its transmission by mosquitoes. Durham and Myers were aware of the risks that they were taking; however, on 16 January 1901, after conducting the fourteenth autopsy on victims of yellow fever both men found they were themselves infected. They were transferred to the Domingos Freire Isolation Hospital in Pari where Durham recovered but Myers died four days later, aged 28. In his subsequent report Durham deduced that they had both been infected through mosquito bites.