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Biden said his administration was working with vaccine manufacturers to develop contingency plans for omicron-specific vaccines or boosters — but that they so far did not believe it will be necessary.
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Several countries, including the United States, have restricted travel from southern Africa while epidemiologists race to learn more.
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Monitoring the Pandemic
A series of graphics tracking U.S. covid-19 cases, deaths and vaccination rates
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The geography of covid-19 vaccinations and hospitalizations across the United States reveal a stark divide: areas with low rates of vaccination have higher rates of admitted patients.
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