Select the correct statement about typhoid.

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(C) Typhoid fever is caused by the bacterium $Salmonella$ $typhi$. Its pathogenicity is primarily attributed to the "$O$"-antigen, which is a lipopoly

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The pathogenicity of the bacterium is due to the "$O$"-antigen present on the surface coat.

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(C) Typhoid fever is caused by the bacterium $Salmonella$ $typhi$. Its pathogenicity is primarily attributed to the "$O$"-antigen, which is a lipopolysaccharide $(LPS)$ component present on the surface coat of the bacterium. While typhoid is an infection of the small intestine, it is not typically described as an acute infection of the stomach. It spreads primarily through contaminated food and water, not through vectors like cockroaches. Regarding vaccines, the $Ty21a$ vaccine is an oral vaccine, whereas $Typhim$ $Vi$ and $Typherix$ are injectable typhoid polysaccharide vaccines.

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