How Delta is breaching even the most effective anti-Covid ...

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How Delta is breaching even the most effective anti-Covid defences

Authorities in many countries, not least China, have had to rethink their vax campaigns

Bloomberg News

The rise of the highly contagious Delta variant is challenging even the most aggressive Covid-19 containment regimes, an ominous sign as economies look to open up and return to pre-pandemic life.

An outbreak that started at an airport in the eastern Chinese city of Nanjing is testing that country’s zero-tolerance measures, which are some of the most sweeping and comprehensive in the world. New infections are rising by the dozens and seeding subsequent clusters around China, despite well-honed systems of mass testing and stringent quarantines. Beijing reported its first locally transmitted infection in six months on Thursday, linked to an outbreak in the southern province of Hunan, among people who’d recently been to Nanjing.

The variant is scaling some of the toughest virus defences, with “Covid Zero” places — countries that had snuffed out the virus within their borders — still seeing outbreaks, despite strict antivirus measures...

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