Pratap, Chandra Bhan, et al. “Targeting of Putative Fimbrial Gene for Detection of S. Typhi in Typhoid Fever and Chronic Typhoid Carriers by Nested PCR”. The Journal of Infection in Developing Countries, vol. 7, no. 07, July 2013, pp. 520-7, doi:10.3855/jidc.2561.