Albert Bourla, Pfizer’s chief executive, had projected that a fourth dose might be needed 12 months after a third shot. But he said on CNBC’s “Squawk Box” that the timeline might need to be moved up. One of the company’s top scientists recently said a fourth shot — possibly one targeting omicron — is likely to be necessary.
More than 40 people in the United States have tested positive for the omicron variant, the director of the Centers for Disease Control and Prevention told the Associated Press on Wednesday. Nearly all of them showed mild symptoms, she said. Elsewhere, the World Health Organization said Wednesday that omicron cases have been reported in 57 countries so far.