University of California
Ucmp: Introduction to Viruses
A brief overview of viruses from the University of California. Discusses the difference between the lysogenic phase and the lytic phase, gives examples of viral diseases, and provides information on the relationship between viruses and...
Wikimedia
Wikipedia: Virus
An encyclopedia article on viruses discusses what they are and their different classifications. It also gives several examples of viruses, how they can be treated, and gives speculation on their origins.