| A | B |
|---|
| Bacteria | Single-cell organisms classified as cocci, bacilli, and curved rods |
| Carrier | A living organism that harbors a pathogen and acts as a source or infection |
| Fungus | Plantlike organisms such as mushrooms; |
| Helminths | Parasitic worm |
| Infection | Disease caused by a pathogen |
| Normal flora | A population os microorganisms that normally inhabit an area such as the skin, intestines, or vagina |
| Nosocomial infection | Hospital-acquired infection |
| Parasites | An organism that requires another living organism |
| Pathogens | Disease-causing organism |
| Protozoa | Single-cell animal-like microbe; |
| Richettsia | Type of small bacteria that must reproduce in a living organism |
| Spores | An encasement that allows the organism to withstand harsh environmental conditions |
| Vector | A carrier of pathogens from host to host |
| Viruses | Pieces of DNA or RNA surrounded by a protein shell |
