All are capsulated EXCEPT:
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.
Klebsiella pneumonia
Hemophilus influenza
Bacillus anthracis
Escherichia coli
Enterobecteriaceae