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US President Joe Biden on Tuesday said that people who are "not fully vaccinated" have "good reason to be concerned" about the spread of the Omicron...

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At least 15 US states have confirmed the presence of Covid-19 variant, Omicron, said US Centers for Disease Control and Prevention...

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The US on Wednesday reported its first case of the 'Omicron' variant of the Covid-19. The case has been detected in the US state of California, Top...