Global and US health chiefs have urged calm over rising Covid cases and new variants, pointing out that virtually everyone now has immunity against the virus.On Thursday, Dr Marion Koopmans — a virologist who advises the — said the world was now in a 'different phase' of the pandemic due to higher levels of immunity from vaccination and previous infection.And in a press call yesterday, the Centers for Disease Control and Prevention () added that America was it is 'strongest point yet' against the virus because of this wall of immunity.
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