Gram Negative Bacilli
The only Species of Shigella that produces exotoxin? (AIIMS May11)
Shigella dysenteriae (Subgroup A)
a.Mannitol nonfermenting bacilli consisting of 10 serotypes.
c.Only member of the shigella family that is always catalase negative is type I.
d.Sh. Dysentariae type 1 forms a toxin (shigela toxin), the earliest example of an exotoxin produced by a gram negative bacillus.
e.Three types of toxic ativities noted: