I've read your threads. It is not clear to me that the speaker wire penetrated the skin of either you or your workmate. From my perspective this seems like something that you are imagining out of anxiety or paranoia. Of course I wasn't there and am only judging by the wording of your posts.
However, IF such a situation happened, there would be no risk (as Teak told you), because the virus doesn't survive on surfaces exposed to air. The needle-type injuries that are of a concern are the hollow-bore needles used in medical settings (because the blood is protected from air).
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