diseases West Nile virus, malaria, plague, and yellow fever. Specifically, it will discuss the history and distribution of the diseases in the United States or worldwide, and compare each of the diseases based on the categories above, as to which is most important individually and overall in terms of relative impact.

West Nile virus only appeared in the United States in 1999, but it has become quite a feared disease since then. The virus is contracted in humans from infected mosquito bites, and it can be deadly in people with weakened immune systems, like children and senior citizens. The symptoms of the disease can be minor, like headaches and an insignificant fever. These can increase to confusion, muscle weakness, high fever, and severe headache ("West Nile," 2004). They usually show up 3 to 14 days after being bitten. Symptoms that are more serious include brain swelling, coma, numbness, vision loss,...
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