Gram Negative Bacilli
All are true about Shigella except:
|A||S. dysenteriae type 2 cause HUS|
|B||S. sonnei causes mildest form of disease|
|C||Bacillary dysentry has incubation period ranging from 1 - 7days|
|D||Classification of Shigella is on basis of mannitol fermentation|
HUS is caused by S. dysenteriae type 1 also called as Shiga’s bacillus as the toxin responsible for HUS, Shiga toxin is only produced by S.dysenteriae.
The mildest bacillary dysentery is caused by S.sonnei, the most severe by S.dysenteriae.
Shigella has 4 species or subgroups-the only sp. not fermenting mannitol is –S.dysenteriae.