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Initially skeptical on your first claim but did find a source: https://www.businessinsider.com/coronavirus-spain-says-rapid... (https://outline.com/uBBJvY)

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Sounds like a test from a single Chinese company and the results were closer to 30% accurate:

> The Chinese Embassy in Spain said that the Bioeasy tests were not part of China's medical donations and that the firm didn't have a license to sell its products.

30% accurate? Does that mean it's better to believe the opposite of what the test says most of the time?

Then it would be 70% accurate

Agreed the worst test would be 50% accurate

Source: https://www.irozhlas.cz/zpravy-domov/ostrava-rychlotesty-kor...

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