Commensalism
One organism benefits, other unaffected
Why do some scientists think commensalism doesn’t exist?
Bc there’s almost always gonna be an impact on the other organism, we just haven’t found it yet
Mutualism
Both organisms benefit
Symbiosis
Relationships of living things that are existing together in the same environment
The relationship between us and our normal flora bacteria
Mutualism
The relationship between us and the E. coli in our normal gut flora
Mutualism
Parasitism
One organism benefits, other harmed
The relationship between us and strep throat
Parasitism
Opportunism
Typically harmless (mutualistic or commensalistic) until opportunity arises, then becomes parasitic
Thrush
Yeast infection of the mouth
Virulence factors
Capsules, fimbrae, drug resistance genes, spores, enzymes, toxins
Factors of microbe
Level of virulence, number of organisms acquired (dose), portal of entry, presence of other organisms (synergy)
True or false
The more virulence factors
