Agglutination in Vi grouping serum is a diagnostic feature used to identify which serovar of Salmonella?

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Multiple Choice

Agglutination in Vi grouping serum is a diagnostic feature used to identify which serovar of Salmonella?

Explanation:
Agglutination with Vi grouping serum relies on antibodies recognizing the Vi capsule, a polysaccharide capsule that is characteristic of Salmonella Typhi. When you mix anti-Vi serum with a Salmonella isolate, only strains that express the Vi antigen will clump together, so a positive Vi agglutination test points to Typhi. The other serovars listed generally lack this Vi capsule, so they do not react with anti-Vi serum. That makes Vi agglutination a diagnostic clue specifically for identifying Salmonella Typhi.

Agglutination with Vi grouping serum relies on antibodies recognizing the Vi capsule, a polysaccharide capsule that is characteristic of Salmonella Typhi. When you mix anti-Vi serum with a Salmonella isolate, only strains that express the Vi antigen will clump together, so a positive Vi agglutination test points to Typhi. The other serovars listed generally lack this Vi capsule, so they do not react with anti-Vi serum. That makes Vi agglutination a diagnostic clue specifically for identifying Salmonella Typhi.

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