Immunizations

Pope Francis arrives to deliver the Urbi et Orbi (Latin for 'to the city and to the world' ) Christmas' day blessing inside the blessing hall of St. Peter's Basilica, at the Vatican, Friday, Dec. 25, 2020. (Vatican Media via AP)

A worker inspects syringes of a vaccine for COVID-19 produced by Sinovac at its factory in Beijing on Thursday, Sept. 24, 2020. With rich countries snapping up supplies of COVID-19 vaccines, some parts of the world may have to rely on Chinese-developed shots to conquer the outbreak. The question: Will they work? (AP Photo/Ng Han Guan)

Nurse Arzu Yildirim poses for the photographer as she holds a CoronaVac vaccine, made by Sinovac, currently on phase III clinical trials at Acibadem Hospital in Istanbul, Monday, Dec. 21, 2020. Turkey has ordered 50 million doses of the vaccine and Health Minister Fahrettin Koca said last week that the first batch was expected to arrive within days and vaccination could start at the end of December or early January.Some 12,500 volunteers are taking part in Phase 3 trials of the vaccine across Turkey but the full vaccination programme is expected to start before the trial is completed. (AP Photo/Emrah Gurel)

Health worker Maria Ramírez is the first to get vaccinated for COVID-19 at the General Hospital in Mexico City, early Thursday, Dec. 24, 2020. The first batches of vaccines produced by Pfizer and its German partner, BioNTech arrived the previous day. (AP Photo/Eduardo Verdugo)

FILE - In this Monday, March 16, 2020 file photo, a glass of Moroccan tea is left by a window of a closed down coffee shop, after the Moroccan government announced further restrictions to avoid the spread of coronavirus, including closure of cafes and mosques, in the capital Rabat, Morocco. Morocco has imposed a curfew, closed restaurants in major cities and banned public and private gatherings for three weeks — including the usually festive New Year's Eve — to curb the spread of the virus.The curfew between 9 p.m and 6 a.m went into effect Wednesday, Dec. 23, 2020 and is set to last until Jan. 13. (AP Photo/Mosa'ab Elshamy, File)

A demonstrator wears a face shield with a red handprint, mimicking blood, to protest Brazilian President Jair Bolsonaro's handling of the deadly coronavirus pandemic in Brasilia, Brazil, Wednesday, Dec. 23, 2020. Protesters also called for the immediate start of COVID-19 vaccinations. (AP Photo/Eraldo Peres)

FILE - In this Nov. 5, 2020, file photo President Donald Trump speaks at the White House in Washington. (AP Photo/Evan Vucci, File)

FILE - This 2020 electron microscope image provided by the National Institute of Allergy and Infectious Diseases - Rocky Mountain Laboratories shows SARS-CoV-2 virus particles which cause COVID-19, isolated from a patient in the U.S., emerging from the surface of cells cultured in a lab. According to two new studies released on Tuesday, Dec. 22, 2020, people who have antibodies from infection with the coronavirus seem less likely to get a second infection for several months and maybe longer. (NIAID-RML via AP)

Surgeon General of the U.S. Jerome Adams, left, elbow-bumps Emergency Room technician Demetrius Mcalister after Mcalister got the Pfizer COVID-19 vaccination at Saint Anthony Hospital in Chicago, on Tuesday, Dec. 22, 2020. (Youngrae Kim/Chicago Tribune via AP, Pool)