The causes of massive splenomegaly (spleen >1000 g) are fewer, and include: 1  visceral leishmaniasis (kala-azar) 2  chronic myelogenous leukemia. 3  myelofibrosis. 4  malaria. 5  splenic marginal zone lymphoma.
Examples of how it can be spread are: Someone infected with the mumps virus is contagious for approximately 15 days (six days before the symptoms start to show, up to nine days after they start). The mumps virus is part of the paramyxovirus family, which is a widespread cause of infection, especially in children.Normally, mumps can be diagnosed by its symptoms alone, especially by examining the facial swelling. In addition to examining this area and taking a note of the symptoms, a doctor may:umps is an extremely contagious viral infection that usually affects children. The condition has a number of symptoms, the most common one being swelling of one or both of the salivary glands on the sides of the face.
Mosquito-borne viruses. Arboviruses, or arthropod-borne viruses, are transmitted by mosquitoes or other blood-sucking insects. Mosquito-borne viruses can cause infections that include West Nile, La Crosse, St. Louis, western equine and eastern equine encephalitis. There are two types of herpes simplex virus (HSV). 2  Either type can cause encephalitis. 3  HSV type 1 (HSV-1) is usually responsible for cold sores or fever blisters around your mouth, and HSV type 2 (HSV-2) commonly causes genital herpes.