(D) The oral vaccine $Ty21a$ is a live attenuated vaccine used to provide immunity against $Salmonella$ $typhi$,the bacterium that causes Typhoid feve

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(D) The oral vaccine $Ty21a$ is a live attenuated vaccine used to provide immunity against $Salmonella$ $typhi$,the bacterium that causes Typhoid fever.It is administered orally to stimulate the immune system to produce antibodies against the pathogen.Therefore,it is used for the prevention of Typhoid.