Efficacy of one or two doses of Ty21a Salmonella typhi vaccine in enteric-coated capsules in a controlled field trial
Robert E. Black(University of Maryland, Baltimore), M. M. Levine(University of Maryland, Baltimore), Catterina Ferreccio(University of Maryland, Baltimore), M L Clements(University of Maryland, Baltimore), Claudio F. Lanata(University of Maryland, Baltimore), J Rooney(University of Maryland, Baltimore), R. Germanier(Swiss Vaccine Research Institute)
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