Among the species of Klebsiella, Klebsiella pneumoniae is extensively studied strain. Findings confirm that it is encapsulated, thus a polysaccharide layer is present outside the cell-wall of this bacterium wherein it can synthesize ATP throughaerobic respiration yet can also alter to anaerobic fermentation for obtaining energy. As a results it isfacultative anaerobic and has a characteristics of becoming both aerobic and anaerobic depending upon the conditions.
A useful element of Klebsiella pneumoniae is the capability tofix atmospheric nitrogen in a more usable form for plants wherein it is found naturally in the water, soil and vegetables like lettuce and leafy vegetables.
Klebsiella bacteria are mostly found in intestine that contributes to the natural flora of humans and animals. But when it is found outside the gut such as in alimentary canal between the stomach and anus it may cause certain deadly infection in humans.
Klebsiella pneumoniae become highly resistance to antibiotics. This kind of bacteria generates an enzyme called carbapenemase when the application of antibiotics carbapenems it will not work to kill the bacteria and it is difficult to treat the infections. In such cases, microbiology laboratories have to run test to determine which antibiotics will treat the infections.