1. Cellular Microbes
1.1. Prokaryotic Microbes (composed of prokaryotic cells)
1.1.1. Bacteria
1.1.1.1. Gram-Positive Bacteria
1.1.1.1.1. Endospore-Formers
1.1.1.1.2. Non Endospore-Formers
1.1.1.2. Gram-Negative Bacteria
1.1.1.2.1. many genera
1.1.1.3. Non-Typical Bacteria
1.1.1.3.1. Acid-Fast Bacteria (AFB)
1.1.1.3.2. Cell Wall Deficient (CWD) Bacteria
1.1.1.3.3. No Cell Wall Bacteria (Mycoplasma spp.)
1.1.2. Archaea
1.2. Eukaryotic Microbes (composed of eukaryotic cells)
1.2.1. Microscopic Fungi
1.2.1.1. Yeasts
1.2.1.2. Molds (Hyphal)
1.2.1.3. Dimorphics
1.2.2. Microscopic Protists
1.2.2.1. Protozoa (animal-like cells)
1.2.2.2. Algae (plant-like cells)
1.2.3. Microscopic Animals (egg, larva, and/or adult forms as applicable)
1.2.3.1. Helminths (parasitic worms)
1.2.3.1.1. Roundworms (Nematodes)
1.2.3.1.2. Flatworms (Platyhelminthes)
1.2.3.2. Arthropods
1.2.3.2.1. mites
1.2.3.2.2. ticks
1.2.3.2.3. mosquitoes
1.2.3.2.4. maggots/flies
1.2.3.3. Water-Dwelling
2. Noncellular (Acellular) Microbes
2.1. Viruses
2.1.1. DNA Viruses
2.1.1.1. Single-Stranded DNA Viruses (ssDNA)
2.1.1.2. Double-Stranded DNA Viruses (dsDNA)
2.1.2. RNA Viruses
2.1.2.1. Single-Stranded RNA Viruses (ssRNA)
2.1.2.1.1. Sense Strand (+) ssRNA Viruses
2.1.2.1.2. Antisense Strand (-) ssRNA Viruses
2.1.2.2. Double-Stranded RNA Viruses (dsRNA)