The data was brought out by a Right to Information query filed by activist Chetan Kothari.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/187-post-immunisation-deaths-recorded-state-last-decade
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mumbai
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/immunisation
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gadchiroli-d
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pune-d
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vaccination
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health