germ
- virus
- microbe
- bacterium
- bacteria
- germ
- organism
- cilia
- pathogen
- infection
- disease
- contagion
- contamination
- microbiology
- health
- medicine
- biology
- science
- microorganism
- pandemic
- epidemic
- outbreak
- amoeba
- flu
- security
- single cell
- unicellular
- vaccine
- immunity
- quarantine