Find the exact value of the given expression. 
Definitions:
Anaerobic Bacteria
Bacteria that thrive in environments lacking oxygen, playing roles in processes like fermentation.
Cholera
An infectious disease caused by the bacterium Vibrio cholerae, leading to severe diarrhea and dehydration.
Spirillum
A spiral-shaped bacterium.
Parasite
An organism that lives on or in another organism and relies on it for nourishment or some other advantage to the detriment of the host organism.
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