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.
Mosquito bite allergy
Individuals with systemic mosquito bite allergies respond to mosquito bites with intense local skin reactions (e.g. blisters, ulcers, necrosis, scarring) and concurrent or subsequent systemic symptoms (high-grade fever and/or malaise; less commonly, muscle cramps, bloody diarrhea, bloody urine, proteinuria, and/or wheezing; or very rarely, symptoms of overt anaphylaxis such as hives, angioedema (i.e. skin swelling in non-mosquito bite areas), shortness of breath, rapid heart rate, and low blood pressure]]. There are very rare reports of death due to anaphylaxis following mosquito bites. Individual with an increased risk of developing severe mosquito bite reactions include those experiencing a particularly large number of mosquito bites, those with no previous exposure to the species of mosquito causing the bites, and those with a not fully developed immune system such as infants and young children. Individuals with certain Epstein-Barr virus-associated lymphoproliferative, non-Epstein-Barr virus malignant lymphoid, or other predisposing disease also have an increased rate of systemic mosquito bite reactions but are considered in a separate category (see below).