<prompt> All are capsulated EXCEPT:Klebsiella pneumoniaHemophilus influenzaBacillus anthracisEscherichia coli  <response>: ANSWER: D Escherichia coliREF: Anantnarayan 8th ed various chapters, Jawetz 24th edition Chapter 16Note: Although K strain of E. coli is capsulated it is the best possible answer amongst the optionsprovidedE cob are classifiedby more than 150 different heat-stable somatic O lipopolysaccharide antigens, more than 100 heat-labile K capsular antigens, and more than 50 H flagellar antigens.K antigens are external to O antigens on some but not all Enterobacteriaceae. Some are polysaccharides, including the K antigens of E. coli; others are proteins.Cell envelope cytoplasmic membrane,peptidoglycan, outer membraneA common mnemonic used to remember some encapsulated pathogens is:Even Some Super Killers Have Pretty Nice big CarsEscherichia coli K strain, Streptococcus pneumoniae, Salmonella, Klebsiella pneumoniae, Haemophilus influenzae, Pseudomonas aeruginosa, Neisseria meningitidis, Bacillus anthracis and Cryptococcus neoformans. 