The partnership will cover about 60% of pharmacies throughout the 50 U.S. states, the District of Columbia, Puerto Rico, and the U.S. Virgin Islands, the U.S. health agency said. Walgreens Boots Alliance Inc, CVS Health Corp, Walmart Inc, Kroger Co and Costco Wholesale Corp are among the companies that have so far agreed to participate, the U.S. agency said in a statement. "We are leveraging the existing private sector infrastructure to get safe and effective vaccines supported by Operation Warp Speed into communities and into arms as quickly as possible with no out-of-pocket costs," HHS Secretary Alex Azar said in a statement.