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The percent of tests performed that are positive (percent positivity) is a critical measure illustrating how widespread transmission is in an area. aj1 top3 The launching of Blanchard’s campaign comes two weeks after Shelby announced that he would retire after 2022 after serving six terms in the Senate. aj1 top3 An atmospheric river storm pumped drenching rains into the heart of California on Thursday as blizzard conditions buried the Sierra Nevada in snow. aj1 top3 Despite this reduction, however, "neutralizing titer levels with B.1.351 remain above levels that are expected to be protective," the company said. aj1 top3