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.
Climate change in Washington
Impacts on "infectious diseases" 
The West Nile Virus is a serious disease linked to climate change in the US that is transmitted by mosquitoes. It favors periods of "drought" and heavy "rain", which are likely to become more common as increased average temperatures in Washington State result in rain replacing snowfall during the winter, resulting in drier summers (chance of drought, particularly east of the Cascades). The mosquitoes will also survive longer because the warmer winters will not eliminate as many bugs as it usually does. Documentation of the West Nile Virus is just beginning in Washington State, but Colorado has been grappling with cases of it since 2002. Total costs there have been estimated at $120 million or $670 million (P. 58), both . Louisiana has been battling cases since 2001, with total costs of $190 million by 2006. In the hopes of avoiding these costs, the Washington Department of Health spends $246,000 per year on surveillance for the virus and Epidemiological follow-up and testing on suspected human cases (P. 59)