What is disease?
An abnormal condition that affects the body of an organism
A disorder of structure or function in an organism, especially one that produces specific signs or symptoms that affect a specific location and are not simply a direct result of physical injury.
Infectious disease
Transmittable, clinically relevant illness
Pathogen
Virulence
Infection
Amensalism
Organism 1 is harmed
Organism 2 neither benefits nor is harmed
Ex: Fungus secreting an antibiotic, inhibiting nearby bacteria
Tuberculosis bacteria in a human lung is an example of
Parasitism
Mites in human hair follicles is an example of
Commensalism
Bacteria in human colon is an example of
Mutualism
Describe the acquisition of normal microbiota
(Ideally) axenic environment