The EBV Infection Spectrum. EBV has a particular affinity for the cells that line the mouth and throat. Once the virus inserts itself into to a specialized immune lymphocyte (B cell), it hijacks the DNA to take control of the cell forever. When cells of the mouth and throat naturally slough off, EBV is shed into saliva.
Causing the Civil War. Historically, textbooks have taught that incompatibility between northern and southern economies caused the Civil War. The industrial revolution in the North, during the first few decades of the 19th century, brought about a machine age economy that relied on wage laborers, not slaves.
The civil war between the French and Viet Minh was a major cause of the war. It is said that the Vietnam War, or the Second Indochina War, was just a continuation of the First Indochina War. The First Indochina War started because of Vietnam's demand for independence from French colonial rule and France's refusal to allow it.