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Xi said China will support Sierra Leone's national development in the areas of culture, education and public health, vowing to encourage Chinese companies to become further engaged in the country's infrastructure construction, mining, telecommunication and agriculture.

China and Africa have forged a profound friendship during the past decades. The two sides have supported each other in the course of their national development and coordinated positions in international affairs.

"If there is one area where we need to do more, is in the area of infrastructural, such as power particular, road, port that will enable us to insist and add value to our natural resources. We are also looking at agriculture and mining. We would be focusing on this in the next few years," she said.

An initial investigation showed that six people who have had close contact with the two have not exhibited flu symptoms.

In Shanghai, a 56-year-old patient surnamed Gu, whose wife died of the H7N9 bird flu on April 3, was confirmed on Saturday as infected by the virus.