MEASLES vaccine comes in powder form. It must be used immediately after it is mixed with a fluid, says Dr Jacob John, former professor of the Department of Clinical Microbiology and Virology . Multi-vial doses of these vaccines must be used within four hours; else they will act as a medium for growing bacteria that can secrete toxins, he says.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/was-it-due-toxic-shock-syndrome
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/new-indian-express-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vaccination
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/child-health
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/measles
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thiruvallur-d