Hosny, Alaa El-Din Shawky, et al. “Immune Response to Vi Polysaccharide, Heat-Killed Whole Cells, and Outer Membrane Protein of Salmonella Typhi”. The Journal of Infection in Developing Countries, vol. 9, no. 06, July 2015, pp. 642-9, doi:10.3855/jidc.6504.