I believe Paramyxo can only be identified by a liver biopsy, which can be falsely negative or by necropsy, which is 100% yes or no.
Sounds like your vet may not be up to date on that virus.
Ask him/her and make sure you're being properly taken care of. This could not only wipe you out but anyone who got anything from the same people you did.
This is NOT something to take lightly.
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