How are bacteria groups separated according to their oxygen requirements?
Obligate aerobes require oxygen for metabolism (eg, Pseudomonas); facultative anaerobes can use aerobic or anaerobic metabolism (eg, Listeria, Entero-bacteriaceae); microaerophilic bacteria require low oxygen tension (eg, Camp-ylobacter); aerotolerant anaerobes can grow with or without oxygen, but only use anaerobic metabolism (Enterococcus faecalis); and obligate anaerobes cannot survive in oxygen (eg, Clostridium).
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