Just as vaccines begin to offer hope for a path out of the pandemic, officials in Britain on Saturday sounded an urgent alarm about what they called a highly contagious new variant of the coronavirus circulating in England.
Citing the rapid spread of the virus through London and surrounding areas, Prime Minister Boris Johnson imposed the country¡¯s most stringent lockdown since March.
¡°When the virus changes its method of attack, we must change our method of defense,¡± he said.
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