Cultivation of Anaerobes


Anaerobic microorganisms are widely spread in environment. They do not require oxygen for their growth. Sometimes these organisms are very toxic. 

There are three types of anaerobes namely, 
Facultative anaerobes, 
Obligate anaerobes and 
Aerotolerant anaerobes. 

Facultative anaerobes: 

They are the organisms that can grow in presence or absence of oxygen. They obtain energy by both respiration as well as fermentation.

E.g.- Staphylococcus spp. Streptococcus spp., Escherichia coli, Salmonella, Listeria spp. and Shewanella oneidensis.

Obligate anaerobes: 

They are the organisms that can grow totally in absence of oxygen. Oxygen is toxic for their normal growth. 

Examples: Actinomyces, Bacteroides, Clostridium, Fusobacterium, Peptostreptococcus, Porphyromonas, Prevotella, Propionibacterium, Veillonella etc.


Aerotolerant anaerobes: 

They are the organisms that cannot use oxygen for growth but are able to tolerate its presence.

Examples: Streptococcus, Clostridium, and Actinomyces.


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