When a large number of children are vaccinated for pneumonia, other children too benefit as the spread of the infection is contained.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/expert-bats-vaccinating-children-against-pneumonia
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/children
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/child-health
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vaccination
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pneumonia
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/immunisation
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chennai-t
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu