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NEET MDS Quiz - Practice Test
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Practice Test

General Microbiology - 3 Questions

1
General Microbiology

What is the significance of "Rose spots" in typhoid fever?

1) They indicate the presence of a complication such as intestinal perforation.

2) They are a diagnostic sign of typhoid fever.

3) They indicate the patient is no longer infectious.

4) They indicate the patient has developed antibodies to the bacterium.

📝 Explanation:

The presence of "Rose spots" can help in diagnosing typhoid fever, as they are relatively specific to this illness. They typically appear in the trunk and are not a result of increased sensitivity to the touch or pressure.

2
General Microbiology

Which of the following is a characteristic microscopic feature of amoebic dysentery that distinguishes it from bacillary dysentery?

1) Presence of RBCs in the stool

2) Presence of pus cells in the stool

3) Presence of Charcot-Leyden crystals

4) Presence of ghost cells

📝 Explanation:

Amoebic dysentery, caused by the protozoan parasite Entamoeba histolytica, is characterized by the presence of ghost cells in the stool. Ghost cells are the remnants of red blood cells that have been phagocytosed by the amoeba. These cells are ingested and their cytoplasm is removed, leaving only the cell membrane, which gives them a "ghost-like" appearance under the microscope. This feature helps distinguish amoebic dysentery from bacillary dysentery, which is caused by bacteria such as Shigella species. Bacillary dysentery typically shows the presence of white blood cells (pus cells) and red blood cells in the stool, but not ghost cells.

3
General Microbiology

What is the typical stool color in bacillary dysentery?

1) Dark red

2) Bright red

3) Yellow

4) Green

📝 Explanation:

Bacillary dysentery, primarily caused by Shigella species, is known for producing stool that is typically bright red in color due to the presence of blood and inflammatory cells. The intense red color is a result of the invasive nature of the bacteria, which damage the intestinal lining leading to bloody diarrhea.

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