Biden set off an investigation into it... He just not going to accuse people or nations without any proof... There is no proof... Did China handle it badly? Yes, initially... There is no proof of anything China neglect... There is one exception, China has a bad past with regulation of their wet markets and SARS 2004 outbreak was suspected to be linked to Chinese Wet Markets.. Now we get into a difficult subject, the wet markets have wild animals (e.g. bat, snakes, monkeys...) these are not meant to be kept in close confides of each other and cross infection can lead to a virus which effects humans... This is very dangerous activity in the hyper spreader globe we live into today. Before this activity would barely get out of a village..
But Chinese wealthy have lobbied to have wet markets and various high end meat it offers... That bat is expensive and a delicacy in China.
But lets be very clear, US had plenty of warning... Much more warning than Europe, sorry but Trump down played the virus... He admitted it, he knew and he said the opposite... He told Governors the opposite, bot sides... President is in charge of the country's defence an he was a complete let down...