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But observers said that the economy has shown signs of a gradual recovery as more restaurants and shopping malls reopened and more workers have returned to factories as production resumed. The lifting of the lockdown in Wuhan, Hubei province, the most affected region in China, has also sent a positive signal that stringent control measures have been effective in containing the virus.

But challenges remain in the supply chains for pasteurized milk, he said. "The cold chains for delivering pasteurized milk are not strong so far even in first and second tier cities not to mention in third and fourth-tier cities," Song said. "Raw milk supply in South China is also limited."

But discerning one bear from another does matter to researchers, according to Zhang Zhihe, chief of the Chengdu base.

But rescuers now have to figure out how to get them out, through several kilometres of dangerously flooded tunnels, or even to attempt to bring them out for now.

But he also stressed that the huge investment in network infrastructure and unclear business models could hinder profits in the short term.