Pfizer says tweaked COVID-19 shots boost Omicron protection

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This undated electron microscope image made available by the U.S. National Institutes of Health in February 2020 shows the Novel Coronavirus SARS-CoV-2, orange, emerging from the surface of cells, green, cultured in the lab. (NIAID-RML via AP) This undated electron microscope image made available by the U.S. National Institutes of Health in February 2020 shows the Novel Coronavirus SARS-CoV-2, orange, emerging from the surface of cells, green, cultured in the lab. (NIAID-RML via AP)

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Ukraine's Zelenskyy hosts talks with UN chief, Turkey leader

As a potential power broker, Turkish President Recep Tayyip Erdogan will use his first visit to Ukraine since the war started nearly six months ago to seek ways to expand the export of grain from Europe's breadbasket to the world's needy. UN Secretary-General Antonio Guterres will use his visit to focus on containing the volatile situation at a Russian-occupied nuclear power plant.

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