MHT CET · BIOLOGY · STD 12 - 10. Human Health and Diseases

Select the correct statement about typhoid.

A It is an acute infection of intestine and stomach.
B It spreads in the population through vectors such as flies, cockroach etc.
C The pathogenicity of bacterium is due to "O" - antigen present on surface coat.
D It is treated with oral vaccine sold as typherix.

Verified Solution

Answer & Solution

Correct Answer

(C) The pathogenicity of bacterium is due to "O" - antigen present on surface coat.

Step-by-step Solution

Detailed explanation

Pathogenicity is due to "O"- antigen, a lipopolysaccharide (LPS), present on surface coat For prevention of typhoid WHO recommends two vaccines as oral (Ty21a vaccine) and injectable (Typhoid polysaccharide vaccine) sold as- typhim vi and typherix.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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