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Chinese scientists also created a model for studying SARS-CoV-2 by creating mice with human-like lung characteristics by using gene-editing technology to give the mice lung cells with the ACE2 receptor - which allows the virus to infect humans.

An official from the US embassy in Beijing told the Washington Post that there was an "entire galaxy of activity, including labs and military labs in Beijing and Wuhan playing around with coronaviruses in ACE2 mice in unsafe labs."

Chinese scientists are known to have been carrying out research to tinker with viruses to make them more infectious.