Tanzania's President Samia Suluhu Hassan receives her Johnson & Johnson vaccine against the coronavirus at the statehouse in Dar es Salaam on July 28. Her administration has reversed the government's anti-vaccination stance. Emmanuel Herman/Reuters hide caption
First lady Jill Biden tours a vaccination site in Nashville with country star Brad Paisley and his wife Kimberly Williams-Paisley. Jason Kempin/Getty Images hide caption
The challenge of refrigerating COVID-19 vaccines is acute in sub-Saharan Africa, where only 28% of health care facilities have reliable power. Jason Beaubien/NPR hide caption
Vaccine doses are in short supply in African countries — and even when they arrive, there may not be a way to get them into people's arms in a timely fashion. Above: People wait to get vaccinated at a hospital in Thika, Kenya, in March. Patrick Meinhardt/Bloomberg via Getty Images hide caption
A dose of Pfizer-Biontech Covid-19 vaccine is prepared in a pharmacy. Ivan Romano/Getty Images hide caption
Holmes County, Ohio, General Health District staff members (from left) Michael Derr, Jennifer Talkington and Abbie Benton prepare materials for a COVID-19 vaccine clinic this month inside St. Peter's Catholic Church in Millersburg. Anna Huntsman/WCPN hide caption
Government health officials are recommending a "pause" in vaccinations with the Johnson & Johnson COVID-19 vaccine. Stephen Zenner/Getty Images hide caption
The U.S. Food and Drug Administration and the Centers for Disease Control and Prevention have recommended a pause in the use of the Johnson & Johnson COVID-19 vaccine, shown here in a hospital in Denver. David Zalubowski/AP hide caption
A public notice hangs outside a vaccination center notifying of vaccine shortages in Mahim, in Mumbai, India, on Thursday. Satish Bate/Hindustan Times via Getty Images hide caption
A nurse administers the Moderna Covid-19 vaccine at Kedren Community Health Center, in South Central Los Angeles, California on February 16, 2021. APU GOMES/AFP via Getty Images hide caption
Thulja Hurkchand as a young woman and with her son Hitesh. She'd tell him, "Don't worry. It's going to be okay. I'm going to be okay." Yet in the face of the pandemic, he couldn't help but worry. Family Photos hide caption
According to the CDC using a brace or mask fitter over a disposable mask or a cloth mask is a good way to make your mask more secure and prevent leaks. Michele Abercrombie/NPR hide caption
An employee makes dry ice pellets at Capitol Carbonic, a dry ice factory in Baltimore in Nov. 2020. Dry ice helps keep COVID-19 vaccines cool during transport. Saul Loeb/AFP via Getty Images hide caption
Amanda Bordeaux, 36, gets her second dose of the Pfizer vaccine during a weekly mass vaccination clinic at the Rosebud hospital in South Dakota. Kirk Siegler/NPR hide caption
Health workers are briefed before conducting COVID-19 swab tests on public transportation drivers at a slum area in Manila. The Philippines is one of the Southeast Asian countries hit hardest by the pandemic. Ezra Acayan/Getty Images hide caption