- Bacterial Pathogens Images Gallery - Excellent links to images of gram positive, gram negative and other bacteria.
- Microbe World- A few images and good descriptions of the different types of microbes
- Medical Microbiology Online Textbook- Excellent resource covering bacteria, viruses, fungi, and parasites
- Images of protists
- Microbiology 101/102 home page - An online course, the purpose is to enlighten non-science students to the wonders of the unseen microbial world that flourishes in and around us.
- Microbiology Lab Image Archive - San Francisco General Hospital
- Acid Fast Microscopy - The New Mexico Scientific Laboratory
- Histotechnology, Technical Methods, Stain for AFB - University of Nottingham Medical School
- Mycobacterium - University of Tennessee, Memphis
- Mycobacteria - CDC Wonder (Public Health Information System)
- Picture It -- Diversity of Life - Picture It Life Forms Links to images of viruses, microbes, plants, animals and other life forms.