Coloured scanning electron micrograph (SEM) of Klebsiella pneumoniae, Gram-negative, encapsulated, non-motile, enteric, rod prokaryote. This species causes Friedlander's pneumonia and urinary tract infections. K. pneumoniae pathogenicity can be attributed to its production of a heat-stable enterotoxin. This bacterium has antibiotic resistance properties. Klebsiella species may contain resistance plasmids(R-plasmids) which confer resistance to such antibiotics as ampicillin and carbenicillin. The R-plasmids can be transferred to other enteric bacteria not necessarily of the same species. Bacillary pneumonia is rare in healthy humans and usually occurs in infants, the elderly, alcoholics, and debilitated or immunocompromised hosts. Magnification: x3,400 when shortest axis printed at 25 millimetres.
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