Bacteria - 3 types
1. cocci = spherical
2. bacilli = rod shaped
3. spriochetes = cork screw
... of an organism, or it's ability to cause disease
occurs with predictability in one specific region or population
the reservoir for growth & multiplication of microorganisms is the natural habitat of the organism
1. infectious agent
3. portal of exit
4. means of transportation
5. portals of entry
5. susceptible host
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