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The latest requirement was announced following a meeting of the city's COVID-19 prevention and control leadership group held on Friday.
The anti-epidemic management at the centralized quarantine venues will be further strengthened and nucleic acid tests targeting related personnel and surroundings will be conducted more frequently, according to the meeting.
Recently, there have been cases in Beijing and other cities across the country in which inbound travelers were confirmed as COVID-19 patients after 14 days of isolated observation, which led to a rebound in indigenous cases.
In response to the problem, Beijing extended the COVID-19 observation period for inbound travelers earlier this month to 21 days following sporadic locally transmitted cases.