- Blood samples unveiled this week show people in California, Oregon and Washington infected in December
- Further tests on blood taken in mid-to-late December and into early January found virus in six more states
- Italy, Brazil and France have all since found traces of the virus before China even acknowledged it existed
- Evidence has emerged in Spain and the UK suggesting that Covid-19 was around before testing was possible
- Claims the virus emerged in a market in Wuhan last winter have crumbled in the face of scientific evidence
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