Immunogenicity and safety of the Vi-CRM197 conjugate vaccine against typhoid fever in adults, children, and infants in south and southeast Asia: results from two randomised, observer-blind, age de-escalation, phase 2 trialsZulfiqar A Bhutta, Audino Podda, Rachid Marhaba et al.|The Lancet Infectious Diseases|2013Cited by 134