China allegedly developed a Covid-19 vaccine before the official outbreak of the pandemic and may be 'hiding something big', a bombshell new US government report says.After a China adviser to the US government heard murmurs of a new pandemic, he looked into the details and found some baffling information.Miles Yu discovered there was no mention at all in official Chinese records of the Wuhan Institute of Virology.So he looked into the Institute's staff records, coronavirus research projects, official announcements and more.That led him to many shocking findings about Beijing's alleged Covid cover-up, according to new book What Really Happened in Wuhan by Sharri Markson.Mr Markson wrote in the explosive book published on September 28 that.