World Health Organization (WHO) have found evidence of a wider Covid outbreak in China in 2019, reports claim.Experts have detected that there were 13 variants in the epicentre Wuhan by December, meaning the virus was more wide-ranging than originally thought.WHO lead investigator Peter Ben Embarek told CNN that his team was able to use partial genetic samples and identify coronavirus cases in December 2019.He said: "The virus was circulating widely in Wuhan in December, which is a new finding."Chinese scientists sent the team 174 cases, of which 100 were confirmed by the WHO team in lab testing and the rest were diagnosed by patient symptoms.The Danish scientist said it is possible there were far more cases, suggested around 1,000 people.