The new vaccine was found to have given a longer immunity from typhoid than older vaccines and it required fewer doses for childhood immunisation.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/big-boost-india-prevention-typhoid-turns-easier-bharat-biotech-vaccine-gets-who-nod
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/financial-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/typhoid
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vaccination
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/child-health
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/immunisation
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/unicef
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health