A virus is a small infectious agent that can't reproduce by itself; once it affects a cell, however, it can tell the cell to make more viruses.

5 Deadly Superbugs That Are On The Rise
5 Deadly Superbugs That Are On The Rise, Written by darrenowen, Scribol staff, Magnified images and text on deadly superbugs - think Resistant E Coli, Methicillin Resistant Staphylococcus Aureus
Bacteria & Virus Study Guide
Bacteria & Virus Study Guide, By C Massengale, Massengale's Biology Junction, See if you can answer the questions presented in this study guide; answers are not provided.
Bacteria 'talk' to each other to coordinate their actions, research says
Bacteria 'talk' to each other to coordinate their actions, research says, October 21, 2015, By Adam Lusher, The Independent UK, Scientists have discovered that bacteria commonly reviled as pri
Bacteria and viruses have DNA too.
Bacteria and viruses have DNA too, DNA Learning Center, Cold Springs Laboratory, Provides a concept, animation, gallery, video, and more.
Bacterial vs. viral infections: How do they differ?
Bacterial vs. viral infections: How do they differ? MayoClinic.com, James M. Steckelberg, M.D., provides the answer.
Biological Viruses
Biological Viruses, Biology-online.org, An overview of viruses.
Flu Attack! How A Virus Invades Your Body
Flu Attack! How A Virus Invades Your Body, NPR.org, Video length: 03:38.
How Do Viruses Reproduce?
How Do Viruses Reproduce?, By Chris Sherwood, eHow Contributor, Brief all-text article.
How Viruses Work
How Viruses Work, by Craig Freudenrich, Ph.D., Discovery Health, Brief 6-page comprehensive article with links to other resources on the last page.
Introduction to the Viruses
Introduction to the Viruses, University of California, Museum of Paleontology, Combination of text and illustrations.
Microorganisms: Viruses
Microorganisms: Viruses, Biology4kids.com, An introduction to viruses.
Overview of Archaea, Protista, and Bacteria
Overview of Archaea, Protista, and Bacteria, By Khan Academy, YouTube.com, Video length: 07:40.
Viral replicaiton Lytic vs lysogenic
Viral replicaiton Lytic vs lysogenic, By Khan Academy, YouTube.com, Video length: 05:10.
Virus
Virus Wikipedia.org An extensive article with photos and illustrations. It directs you to other pages that explain different groups of viruses (DNA & RNA).
Virus Matching Exercises
Virus Matching Exercises, By Kristine Snow, Wisc-Online.com, "Learners complete two exercises. In the first quiz, they divide viruses into two categories: RNA and DNA. They later match each vir
Virus Structure
Virus Structure, by Michael W. Davidson, Florida State University, Mostly text with two excellent illustrations.
Viruses
Viruses, By Jonathan Harris, Wisc-Online.com, "In this animated learning object, students examine the life cycles of a virus."
Viruses Study Guide
Viruses Study Guide By C Massengale See if you know the answer to the questions on this page; answers are not provided.
Viruses: Structure, Function, and Uses
Viruses: Structure, Function, and Uses, W.H. Freeman Company, National Center for Biotechnology Information, National Institute of Health, Mostly text with multiple "Figures" you can click on fo
What Are Germs?
What Are Germs? KidsHealth.org Viruses are just one of the germs that are discussed here. Also learn how to protect yourself from germs.
What are Viruses?
What are Viruses?, The Children's University of Manchester, For younger students, it is a combination of text and illustrations on viruses covering their appearance, how you can become infected, i
What is a capsid and what is its purpose?
What is a capsid and what is its purpose? Yahoo Answers Visit the site for two good answers to the question.
What Is An Infectious Virus?
What Is An Infectious Virus?, By Science Prof Online, "Viruses are not living cells, but efficient parasites that commandeer living cells and turn them into virus factories. Learn how these nonliv