THE FOLLOWING ORGANISMS ARE LACTOSE FERMENTERS EXCEPT:
- A- E. COLI.
- B- ENTEROBACTER COLACAE.
- C- SHIGELLA SONNEI***
- D- PROTEUS SPP.
The correct answer is C- Shigella sonnei.
Shigella sonnei is a Gram-negative bacterium that is responsible for shigellosis, a type of bacterial dysentery. Shigella sonnei does not ferment lactose, which means that it does not produce lactic acid from lactose. This is in contrast to the other three organisms listed, which all do ferment lactose.
- E. coli:
is a Gram-negative bacterium that is commonly found in the intestines of humans and animals. E. coli can ferment lactose to produce lactic acid, gas, and energy.
- Enterobacter cloacae:
is a Gram-negative bacterium that is commonly found in the environment, including soil, water, and sewage. Enterobacter cloacae can ferment lactose to produce lactic acid, gas, and energy.
- Proteus spp:
are Gram-negative bacteria that are commonly found in the environment, including soil, water, and sewage. Proteus spp. can ferment lactose to produce lactic acid, gas, and energy.
Therefore, the only organism listed that does not ferment lactose is Shigella sonnei.
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Clinical Pathology