Question

Typhoid is caused by

• A. Pseudomonas spp.
• B. Staphylococcus spp.
• C. Bacillus spp.
• D. Salmonella Typhi

Hint:

Typhoid spreads through contaminated food and water and is caused by a specific rod shaped bacterium found in the gut.

Answer 1

The Correct Option is D

Step 1: Identify the disease and its cause.
Typhoid fever is a serious bacterial infection spread mainly through contaminated food and water. The germ that causes it is Salmonella Typhi, a rod shaped bacterium that lives in the human gut and spreads through the faecal oral route.

Step 2: Check why the other bacteria do not fit.
Pseudomonas spp. are usually linked with wound infections and infections picked up in hospital settings, not typhoid. Staphylococcus spp. cause skin boils, abscesses and food poisoning from toxins, not typhoid fever. Bacillus spp. cause conditions like anthrax and some cases of food poisoning, but again not typhoid.

Step 3: Confirm the correct organism.
Only Salmonella Typhi produces the classic typhoid picture of prolonged fever, abdominal pain and rose colored spots on the skin. This matches option (D).

Final Answer:
Typhoid is caused by Salmonella Typhi. \[ \boxed{\text{Salmonella Typhi}} \]