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Reply To: Swab came back negative but the sore looked exactly like herpes

quietkettle 1 month ago

It can, and timing is the usual reason. A swab looks for virus present in the lesion, so the amount you can detect drops as the sore heals. Swabbed early in a fresh lesion it is a strong test. Swabbed once it has crusted over it is much less reliable.

How many days in were you when they took it?

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