DEERFIELD, Ill. — Walgreens and the United Nations Foundation have kicked off the fifth year of the Get a Shot. Give a Shot. campaign.

To date, Get a Shot. Give a Shot. has provided 20 million polio and measles vaccines to people in developing countries, according to the retailer.

For every vaccination administered through August 2018 at its Healthcare Clinics and Walgreens and Duane Reade pharmacies, the company will donate the value of a vaccine through the foundation’s Shot@Life campaign.

Shot@Life aims to protect children worldwide by providing lifesaving vaccines. Collaborations with corporations and other organizations are effective in broadening American support for childhood immunizations in developing countries.

“Families everywhere deserve the opportunity to keep their children safe from preventable diseases like measles and polio, and thanks to this program, Walgreens customers can help support the Shot@Life campaign and ensure every child has a shot at a healthy life,” declared Kathy Calvin, president and chief executive officer of the United Nations Foundation.

In North America, Walgreens is gearing up to provide flu shots for students heading back to school and for other customers preparing for a change of season. The retailer noted that flu shots are available during all pharmacy and clinic hours while an immunizing health professional is on duty, including evenings, overnights at 24-hour pharmacy locations, weekends and holidays. No appointment is necessary.

“Each flu season is unpredictable, which is why a flu shot is the most important preventive measure to take to protect yourself and those around you throughout the flu season,” explained Richard Ashworth, Walgreens president of pharmacy and retail operations.

Walgreens also noted that it interacts each day with more than 10 million customers. It operates 8,175 drug stores, with a presence in all 50 states, the District of Columbia, Puerto Rico and the U.S. Virgin Islands, along with its omnichannel business, Walgreens.com. Approximately 400 Walgreens stores offer Healthcare Clinic or other provider retail clinic ­services.

The United Nations Foundation builds public-private partnerships to address some of the world’s most pressing problems, and uses advocacy and public outreach to broaden support for the United Nations.