A vaccine for parasitic intestinal worms has been shown to be safe in Brazilian clinical trials, according to its US developer.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/first-hookworm-vaccine-passes-brazilian-safety-trial
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/environment-news-network
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diseases
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/infectious-diseases
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/brazil
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drugs
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/children
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vaccination