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badboybjorn
Booster can't affect the PCR as the PCR is looking for bits of viral RNA that aren't present in any of the vaccines.
PCR within 5 weeks of having covid is another matter though. In reality it is only a very small percentage of people that continue to test positive on PCR way after the infection has cleared up. The ONS has figures on this, I think the phrase to look for is "clearance time".