American Institute of Biological Sciences
Action Bioscience: Bacteria: More Than Pathogens
An explanation of the differences between bacteria and viruses. Further details are given showing that not all bacteria are bad.
CK-12 Foundation
Ck 12: Life Science: Harmful Bacteria
[Free Registration/Login may be required to access all resource tools.] With so many species of bacteria, some are bound to be harmful. Harmful bacteria can make you sick. They can also ruin food and be used to hurt people. Learn more...