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Thousands protest China's zero-COVID policy

Thousands protest China's zero-COVID policy

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PBS News Hour

How scientists use wastewater to track the spread of COVID

As the newest dominant COVID subvariants BQ.1 and BQ.1.1 emerge, scientists are looking beyond traditional methods to track its spread. One important tool in their arsenal is wastewater surveillance. Special correspondent Cat Wise reports from California, one of the first states to test wastewater for COVID.
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