PATHOGENIC MICROBIOLOGY


Symbiotic Relationships


 
 


 
 
Symbiotic
Relationship

Living Apart
(Not Interacting)
Organism  Organism
   A                B   

Living Together
(Interacting)
Organism  Organism
   A                B   

 
 
 
Population Effects
Neutralism 0                  0 0                  0 Neither population affected
Competition 0                  0 -                  - Elimination of population most affected
Mutualism -                  - +                  + Populations must interact
Commensalism -                  0 +                  0 A must interact;
B not affected
Parasitism -                  0 +                  - A (Parasite) must interact;
B (Host) negatively affected

 

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Revised: September 2003
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