Live attenuated oral vaccine, age and anti-Vi antibody status at baseline significantly affect attack rate in a human Salmonella Typhi challenge model. Issue 6 (December 2015) - Darton, Thomas; Jones, Claire; Waddington, Claire; Blohmke, Christoph; Peters, Anna; Haworth, Kathryn; Green, Christopher; Jeppesen, Catherine; Moore, Maria; Thompson, Ben; John, Tessa; Kingsley, Robert; et al.