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Howard
Greenbank
Even this is dubious.
The PCR test is incredibly sensitive, it only needs a few non-inert bits of virus particles for it to return a positive test.
Someone who is infectious could sneeze or cough on a potato and a swab of that potato taken within a few hours would test positive.
So a positive PCR test doesn't tell you whether the virus was able to reproduce within the cat and the cat was actively infectious, or just whether the cat had just picked up enough virus material on/in whichever part of its body was swabbed to return a positive PCR test.