What is the West Nile virus? How is it transmitted? Find the answers to these questions at this website. Also, learn how the virus affects the body and what you can do to prevent getting the virus.

[Free Registration/Login may be required to access all resource tools.] Viruses cause many human diseases. They can range from mild to fatal. This activity explains how viruses cause human disease.

Rose Eveleth shares why scientists are not sure about the benefits of mosquitos. [2:40]