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Pfizer asks FDA to authorize 2nd Covid booster for people 65 and older If the FDA authorizes it, the additional shot would go to people who are among those with the highest risk of serious illness. NBC News

Pfizer and BioNTech are expected to seek U.S. authorization this week for a second Covid-19 vaccine booster for people 65 and older, according to a person familiar with the plans.

Omicron sub-variant makes up 23.1% of COVID variants in U.S. - CDC According to the CDC's data, the sub-variant now makes up 39% of total cases in regions including New Jersey, New York, Puerto Rico and Virgin Islands. In states such as Connecticut, Maine, Massachusetts, New Hampshire, Vermont and Rhode Island, the sub-variant now makes up about 38.6% of total cases. U.S. daily cases have started to decline in recent weeks after touching record levels in January, with the CDC dramatically easing its COVID-19 guidelines for masks, including in schools. YahooNews

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Medics and volunteers try to prop up Ukraine's health system When Russian bombs started falling on Kyiv, oncologist Nataliia Verovkina fled with her 10-year-old son. But once he was safe in Munich with his grandparents, she turned around and went back. Jennifer Rigby Reuters

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Covid cases rise in Europe as omicron subvariant spreads. Will the U.S. be next? Nearly half of European countries have recorded increases in new Covid cases over the last week. The U.S. could follow suit, but cases are still declining for now. NBC News

Nearly half of all European countries have recorded increases in new Covid-19 cases in the past week, according to an NBC News analysis of data from the Johns Hopkins Coronavirus Resource Center.