By May 1, the Global Polio Eradication Initiative hopes, hundreds of millions of new vaccine doses will be moved to refrigerated warehouses all over the developing world, while millions of old doses are gathered and destroyed.
from
http://www.seattletimes.com/nation-world/for-polio-vaccines-a-worldwide-switch-to-new-version/?utm_source=RSS&utm_medium=Referral&%23038;utm_campaign=RSS_seattle-news
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