Chinese laboratories identified a mystery virus as a highly infectious new pathogen by late December last year, but they were ordered to stop tests, destroy samples and suppress the news, a Chinese media outlet has revealed.

A regional health official in Wuhan, centre of the outbreak, demanded the destruction of the lab samples that established the cause of unexplained viral pneumonia on January 1. China did not acknowledge there was human-to-human transmission until more than three weeks later.

The detailed revelations by Caixin Global, a respected independent publication, provide the clearest evidence yet of the scale of the cover-up in the crucial early weeks when the opportunity was lost to control the outbreak.

As word of a mysterious virus mounted, Li Wenliang shared suspicions in a private chat with his fellow medical school graduates.

The doctor said that seven people seemed to have contracted SARS ‐ the respiratory illness that spread from China to more than two dozen countries and left hundreds dead in the early 2000s. One patient was quarantined at his hospital in Wuhan, China, Li said. He urged people to be careful.

Li and seven other doctors were quickly summoned by Chinese authorities for propagating "rumors" about SARS-like cases in the area ‐ but their warnings were prescient. Soon, health officials worldwide would be scrambling to combat a novel virus with a striking genetic resemblance to SARS.