An epidemiological study published in the medical journal Lancet traced the source of coronavirus disease to a single source .
An epidemiological study of the first 72,314 cases released by the Chinese government and an article published at the medical journal Lancet , there may have been a `` continuous common source '' of the outbreak in December 2019 , which would imply that several animal to human zoonotic events occurred at the Huanan Seafood Wholesale Market .
Coronavirus disease 2019