All are capsulated EXCEPT:
Klebsiella pneumonia
Hemophilus influenza
Bacillus anthracis
Escherichia coli
ANSWER: (D) Escherichia coliREF: Anantnarayan 8th ed various chapters, Jawetz 24th edition Chapter 16(Note: Although K strain of E. coli is capsulated it is the best possible answer amongst the optionsprovided)E 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 membrane)A common mnemonic used to remember some encapsulated pathogens is:"Even Some Super Killers Have Pretty Nice big Cars"Escherichia coli (K strain), Streptococcus pneumoniae, Salmonella, Klebsiella pneumoniae, Haemophilus influenzae, Pseudomonas aeruginosa, Neisseria meningitidis, Bacillus anthracis and Cryptococcus neoformans.
Enterobecteriaceae