A report published one day earlier from Peking University, Guangxi Traditional Chinese Medical University, Ningbo University and Wuhan Biology Engineering College compares the codon usage bias of 2019-nCoV with "humans, bats, chickens, hedgehogs, pangolins, and two species of snakes", and they concluded that "snake is the most probable wildlife animal reservoir for the 2019‐nCoV" which then transmitted to humans.