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Maybe it's different in China but in most countries the labs that handle common blood tests are generic, commercial entities that follow a standard process for things to test.

They aren't doing infectious disease research and they definitely aren't checking for anything exotic.

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In Korea (not China), but here it is common to get PCR assays for infections when the cause is unknown. People are also tested to determine the type (type A influenza) when showing flu-like symptoms. So if someone comes in with severe flu-like systems but is not a match for flu, that may trigger further assays.

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