A child receives the Pfizer BioNTech COVID-19 vaccine at the Fairfax County Government Center in Annandale, Va., in November 2021. A committee of advisers to the Food and Drug Administration recommended Wednesday that the agency expand authorization of COVID-19 vaccines to children as young as 6-months-old. Chip Somodevilla/Getty Images hide caption
A case of COVID-19 brought 12-year-old Harry Nelson to the emergency room in Syracuse, N.Y., where cases are surging, His mother, photographer Paula Nelson, says he first had mild symptoms — just a headache — but later ran a high fever and began vomiting, which meant he couldn't keep down fever-relief meds. At the ER, he needed saline to rehydrate, Tylenol for his fever and meds to stop vomiting. Paula Nelson for NPR hide caption
Rosy, 6, gives COVID tests and vaccines to her stuffed animals. She herself has been exposed to SARS-CoV-2, the coronavirus that causes COVID-19, multiple times and never tested positive. What's her secret? Michaeleen Doucleff/NPR hide caption
Young women wait to get vaccinated by Namra, a 21-year-old health worker who's part of a national door-to-door vaccination effort in the informal Hindubasti settlement in Karachi. Diaa Hadid/NPR hide caption
A health worker in Mexico City prepares a Sputnik V dose during a mass vaccination effort against COVID-19. A new study in Mexico shows that non-mRNA vaccines like the Russian version can be as effective as mRNA vaccines like Pfizer if the patient has previously been infected with SARS-CoV-2. Luis Barron/Eyepix Group/Barcroft Media via Getty Images hide caption
A Cuban industrial complex prepares to start production of one of the country's newly developed COVID vaccines. Yander Zamora/Pool/AFP via Getty Images hide caption
With its new COVID-19 vaccine, Pfizer and BioNTech are hoping to get ahead of worsening effects of omicron as well as any new variants. Jonas Roosens/Belga Mag/AFP via Getty Images hide caption
The Glorietta Mall in Makati City in metro Manila was transformed into a mass vaccination site on December 1 during a government-sponsored campaign to increase the number of people vaccinated across the country. Ella Mage/NPR hide caption
Safeway pharmacist Shahrzad Khoobyari administers a Pfizer-BioNTech COVID-19 booster shot into the arm of Norman Solomon in San Rafael, Calif., in October. Justin Sullivan/Getty Images hide caption
Pharmacist LaChandra McGowan prepares a dose of the Pfizer COVID-19 vaccine at a clinic operated by DePaul Community Health in New Orleans in August. Soon, children ages 5 to 11 could be eligible for Pfizer shots. Mario Tama/Getty Images hide caption
A health care worker administers a Pfizer-BioNTech COVID-19 vaccine Thursday at Life of Hope Center in New York City. Michael M. Santiago/Getty Images hide caption
A health care worker prepares a dose of the Moderna COVID-19 vaccine during a clinic held at the Watts Juneteenth Street Fair in the Watts neighborhood of Los Angeles. Patrick T. Fallon/AFP via Getty Images hide caption
Janet Gerber, a health department worker in Louisville, Ky., processes boxes containing vials of the Johnson & Johnson COVID vaccine in March. Jon Cherry/Getty Images hide caption
A nurse prepares a dose of the Moderna COVID-19 vaccine at a San Antonio senior center in March. A panel of advisers to the Food and Drug Administration will meet Thursday to review Moderna's booster shot. Sergio Flores/Getty Images hide caption
One thorny issue facing President Biden at the United Nations: the defense deal he announced with Australia and the U.K., which left France so angry it pulled its ambassador from Washington, D.C. Win McNamee/Getty Images hide caption