Covid global report: Omicron alert in southern Chinese city bordering Macau

• Buses suspended in Zhuhai as mass tests return positives
• In US, CDC urges use of the most protective' masks
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The southern Chinese city of Zhuhai has suspended public bus routes after announcing it had detected at least seven cases of the highly transmissible Omicron coronavirus variant there and warning residents not to leave the city.

The coastal city, which borders the gambling hub Macau, said late on Friday that Omicron had been detected in one mildly ill and six asymptomatic patients, after mass testing due to a case in a neighbouring city.