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.
Jean Charles Faget
His medical practice began during an era when yellow fever was a tremendous problem in New Orleans. The exact cause of yellow fever was not known at the time. Early scientists believed that it was caused by environmental problems like rotting food, weather conditions, and poor sanitation. Faget's observations of the disease prompted him to believe that the disease could be attributed to a specific microorganism. It is now known that yellow fever is a virus that is transmitted by the bite of female mosquitoes (the yellow fever mosquito, "Aedes aegypti", and other species) and is found in tropical and subtropical areas in South America and Africa. The origin of the disease is most likely to be Africa, from where it was introduced to South America through the slave trade in the 16th century. During Faget's lifetime, yellow fever was deemed one of the most dangerous infectious diseases.