University of Pittsburgh: Peter H. Russell's "Poxviridae (Veterinary Virology)"
Study these slides. Note that poxviruses cause most diseases with the word "pox" in their names. The major exception is chickenpox, which is caused by herpesvirus, our next topic.
Click http://web.archive.org/web/20100819202418/http://www.pitt.edu/~super1/lecture/lec3421/001.htm link to open resource.