Latest Science Typhoid: Study confirms Vi-DT conjugate vaccine is safe and immunogenic in children 6-23 months of age A new study conducted by IVI in collaboration with SK bioscience shows that single-dose and two-dose regimens of Vi-DT typhoid conjugate vaccine (TCV) are safe and immunogenic in children 6-23 months of age, a group... 21 September, 20202 min read