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Nuns watch Pope Francis as he recites the Regina Caeli noon prayer from the window of his studio overlooking St.Peter's Square, at the Vatican, Sunday, April 18, 2021. Pope Francis said he is happy to be back greeting the faithful in St. Peter’s Square faithful for his traditional Sunday noon blessing after weeks of lockdown measures. (AP Photo/Andrew Medichini)

A health worker administers the COVISHIELD vaccine for COVID-19 at a vaccination center in Mumbai, India, Sunday, April 18, 2021. Over 200,000 new infections were detected in the past 24 hours, and major cities, like Mumbai and New Delhi, are under virus restrictions. (AP Photo/Rafiq Maqbool)

FILE - In this Feb. 1, 2021 file photo, passengers are checked by French police officers prior to boarding their plane at Paris Charles de Gaulle Airport in Roissy, north of Paris. France is imposing entry restrictions on travelers from four countries — Argentina, Chile, South Africa and Brazil — in hopes of keeping out especially contagious coronavirus variants, the government has announced. (AP Photo/Francois Mori, File)

Alberto Pena, 73, attends a protest demanding a more equitable and faster distribution of COVID-19 vaccines, in the Los Palos Grandes neighborhood of Caracas, Venezuela, Saturday, April 17, 2021. Pena said he is yet to be vaccinated. (AP Photo/Ariana Cubillos)

Indian's wait to receive vaccine for COVID-19 at a vaccination center in Mumbai, India, Sunday, April 18, 2021. Over 200,000 new infections were detected in the past 24 hours, and major cities, like Mumbai and New Delhi, are under virus restrictions. (AP Photo/Rafiq Maqbool)

German Chancellor Angela Merkel holds a candle during a memorial service in Berlin, Germany, Sunday, April 18, 2021 in remembrance of Germany's corona dead. (AP Photo/Michael Sohn, pool)

An elderly woman waits to receive vaccine for COVID-19 at a vaccination center in Mumbai, India, Sunday, April 18, 2021. Over 200,000 new infections were detected in the past 24 hours, and major cities, like Mumbai and New Delhi, are under virus restrictions. (AP Photo/Rafiq Maqbool)

People receive a dose of the COVID-19 vaccine and then wait for an observation period at a vaccine clinic hosted by Casa San Jose and the Pittsburgh Hispanic Development Corporation, Saturday, April 17, 2021, in Beechview area of Pittsburgh. The clinic was organized to help ease language barriers and lessen vaccine hesitancy in Latin communities with outreach and translators available at the clinic. (Alexandra Wimley/Pittsburgh Post-Gazette via AP)

A buffalo crosses a street past a billboard erected as part of a campaign for vaccination against COVID-19 during a weekend lockdown to curb the spread of coronavirus in Prayagraj, India, Sunday, April 18, 2021. (AP Photo/Rajesh Kumar Singh)

People check-in for a flight to Miami at Silvio Pettirossi Airport, in Luque Paraguay, Saturday, April 17, 2021. Some of Paraguayan travelers are going to the United States expecting to get a vaccine against COVID-19. (AP Photo/Jorge Saenz)