University of South Carolina School of Medicine Richard Hunt's "Picornaviruses Part One: Enteroviruses and General Features of Picornaviruses"
Read this article to learn about Picornaviruses, which cause intestinal problems as well as the common cold.
Click http://web.archive.org/web/20160306083631/http://microbiologybook.org/virol/picorna.htm link to open resource.