DEERFIELD, Ill.--(BUSINESS WIRE)--Over the last two years, Walgreens has helped to provide 7 million life-saving vaccines to children in developing countries through the Get a Shot. Give a Shot® campaign, and its growing collaboration with the United Nations Foundation. Today, Get a Shot. Give a Shot kicks off its third and most comprehensive campaign, with Walgreens pledging to help provide a life-saving vaccine for every immunization administered at a Walgreens pharmacy, Healthcare Clinic or