Delta variant challenges China's zero Covid strategy — and raises questions over its vaccine efficacy - CNN

1. Delta variant challenges China's zero Covid strategy — and raises questions over its vaccine efficacy  CNN
2. China tests millions as Nanjing airport outbreak sees Covid cases surge  The Guardian
3. China Covid: Concerns grow as Delta outbreak spreads  BBC News
4. China Tests Millions, Issues New Travel Guidances as Outbreak Spreads  Newsweek
5. Virus Flares Again in Wuhan as Delta Challenges China's Defenses  Bloomberg
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