Clinical immunology : the official journal of the Clinical Immunology Society
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The live oral typhoid vaccine Ty21a elicits predominantly CD8+, as well as CD4+ T cells mediated immune responses. Clinical field studies showed that Ty21a is moderately effective against S. Typhi and S. ⋯ Typhi and S. Paratyphi B, but not to S. Paratyphi A.