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>there are claims that covid was detected in the US months before covid spread in Wuhan.

I've heard claims it spread in China months before it's official detection in Wuhan, but not regarding the US. Source?

It was detected in European samples (Spain, Italy) collected as early as March 2019 and is likely to have been spreading around the US by that point already.

https://www.reuters.com/article/us-health-coronavirus-spain-...

Those claims were never published in peer reviewed journals and were very likely just false positives:

https://en.ara.cat/society/inaccurate-data-led-to-belief-tha...

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