Nath G, Singh YK, Kumar K, Gulati AK, Shukla VK, Khanna AK, Tripathi SK, Jain AK, Kumar M, Singh TB (2008) Association of carcinoma of the gallbladder with typhoid carriage in a typhoid endemic area using nested PCR. J Infect Dev Ctries 2:302–307. doi: 10.3855/jidc.226