Palestinian elementary school students wearing protective face masks take their seats in their classroom amid the coronavirus pandemic on the first day of class in September at a United Nations-run school in the West Bank city of Ramallah. Majdi Mohammed/AP hide caption
A man speaks on his mobile phone in the Mahane Yehuda market in Jerusalem in December. In the early days of the pandemic, Israel began using a mass surveillance tool on its own people, tracking civilians' mobile phones to halt the spread of the coronavirus. Maya Alleruzzo/AP hide caption
The first box of Johnson & Johnson's COVID-19 vaccine departs from a facility in Shepherdsville, Ky., on Monday. The company is set to distribute its first 3.9 million doses across the U.S. this week. Timothy D. Easley/Getty Images hide caption
People with extra weight — those that have a BMI of at least 30 — are at a greater risk of falling severely ill from COVID-19. David Goldman/AP hide caption
A health care worker holds a vial of the Johnson & Johnson COVID-19 vaccine at Klerksdorp Hospital in Klerksdorp, South Africa, on Feb. 18. PHILL MAGAKOE/AFP via Getty Images hide caption
A health care worker withdrew a dose of the Johnson & Johnson COVID-19 vaccine from a vial at the Klerksdorp Hospital in Klerksdorp, South Africa, on Feb. 18. Phill Magakoe/AFP via Getty Images hide caption
Centers for Disease Control and Prevention Director Rochelle Walensky said on Friday that the says that the 7-day average of confirmed cases in the U.S. has ticked up for the past three days, warning that "now is not the time to relax restrictions." Jim Watson/AFP via Getty Images hide caption
A British Airways plane comes in to land behind a tail fin at Heathrow Airport in London. On Friday, the head of the group that owns BA called for instituting an electronic health pass for passengers as the company announced steep losses due to COVID-19. Kirsty Wigglesworth/AP hide caption
The Olympic rings displayed outside the National Stadium, a venue for the 2020 Olympic Games, in Tokyo last year. The Games have been delayed until 2021 because of the coronavirus. Behrouz Mehri/AFP via Getty Images hide caption
President Joe Biden, pictured on the campaign trail in Nov. 2020, has long encouraged Americans to mask up in the fight against COVID-19. On Wednesday, his administration announced it will provide 25 million masks to community health centers and food banks across the country. Carolyn Kaster/AP hide caption
A medical worker gives a coronavirus vaccine shot to a patient at a vaccination facility in Beijing, in January. Two pharmaceutical companies in China announced Wednesday they are seeking market approval for new vaccines. Mark Schiefelbein/AP hide caption
A shipment of COVID-19 vaccines from the COVAX global program arrived at the Kotoka International Airport in Accra on Wednesday, as Ghana received the group's first vaccine shipment. Nipah Dennis/AFP via Getty Images hide caption
A health care worker looks away as she's immunized with Johnson & Johnson's COVID-19 vaccine at Klerksdorp Hospital in Klerksdorp, South Africa, on Feb. 18. Phill Magakoe/AFP via Getty Images hide caption
People wait in front of the hospital of the Military Medical Academy in Sofia, Bulgaria, on Feb. 21 for a COVID-19 vaccination. NurPhoto/Getty Images hide caption
