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Antibodies are produced by the immune system when the body is invaded by a virus. Scientists hope to use the test to estimate the extent of COVID-19 infections, because there is a report that 30 to 50 percent of infected populations have zero or minor symptoms, and there has been a shortage of tests in many places.

Another 15 people were injured and have been sent to hospital, where they remain in stable condition, the office said.

Apart from building a sound domestic consumption environment, Xian Guoyi, director-general at the ministry's department of trade in services and commercial services, said the government will study and formulate a negative list for cross-border service trade in 2020.

Another highlight of the exhibition enables visitors to "roam on Mars" through VR.

Another source said late last month that negotiations on rules on regulating capital flows also played a role in the delay of the launch of the trading scheme, as the State Administration of Foreign Exchange has been concerned about possible turbulence on currency exchanges.