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obligate aerobes, e.g., Pseudomonas sp. common cause of
nosocomial infections
obligate anerobes e.g, Bacteroides sp.-killed by free
oxygen-a prominent microganism in the gut
microaerophiles e..g, Camplyobacter sp. require small but
definite amounts of oxygen (Camplybacter is also a capnophiles or
carbon dioxide loving organism (require CO2 at levels higher than is
normally present in atmosphere)).
facultative anaerobes- ordinarily grow fine in oxygen but
can grow under anaerobic conditions, e.g., Escherichia coli
Aerotolerant anaerobes can survive in the presence
of oxygen but do not use it in their metabolism. Lactobacillus sp. is
always fermentative whether or not oxygen is present.