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.
Among the hardest hit is Australia, where Delta is slipping through the mandatory hotel quarantine system far more easily than past strains and taking advantage of a low community vaccination rate. A Delta-fuelled outbreak even forced Sydney, despite its efficient contact tracing and testing apparatus, into weeks of lockdown, with cases climbing to nearly 3,000 since mid-June.
The variant, which first emerged in India and is more transmittable than other strains, is exposing the limitations of the strategy of virus elimination, which is also favoured by New Zealand and Singapore. Taiwan, which went months without any infections at all in 2020, recently backed away from Covid Zero, saying it was no longer targeting nil cases but transitioning towards a strategy of living with the virus.
The cluster has placed every one of the roughly 3,000 theatregoers in Hunan at risk of infection, local authorities said, indicating that the number could grow. Despite its largely closed borders, China has also seen more frequent virus flare-ups since the beginning of 2021 as variants from other hotspots around the world get in, often through workers in high-risk areas such as airports and cargo centres.
So the China vaccine is not so effective against the Delta variant as the Pfizer & Moderna vaccines according to this article.
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