The source has been identified as a food seller who caught cholera during a previous outbreak in eastern Cuba
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/cuba-confirms-51-cholera-cases-havana
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/bbc-uk
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cuba
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cholera
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waterborne-diseases
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diseases