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"Donation is better than wasting this precious resource," said Liang, 33.

"Even so, with more bankruptcies and job cuts announced in the retail sector, for example, the economy remains at significant risk in the weeks and months ahead. As the COVID-19 outbreak has recently intensified in some states, hopes for an accelerated sustained and successful re-opening of the economy have hit roadblocks. This raises concern about the economy's rebound."

"Direct saliva testing can address bottlenecks of time, cost and supplies. Our test also has unique features that enable fast and frequent testing on a large scale," said Martin Burke, a chemistry professor who helped design the test.

"Despite limited room for policy easing and the authorities' cautious policy stance, we believe the government will need to increase monetary and fiscal measures to stabilize financial markets and bolster growth because of strong growth headwinds," said Lu Ting, chief economist with Nomura Securities.

"Different cities will have different standards based on their conditions. Those who fail to meet their air quality improvement targets will be held accountable," Liu added. "In the coming months, we will make every effort to implement all tasks, vigorously reduce the emissions of major air pollutants and ensure the completion of the goal to improve air quality in autumn and winter."