| "q" ?
I saw the question asked, but not answered; Do you have a quarintine system? Was the fish quarantined before adding tot he pond?
Sounds like you brought in a new stran of bug the existing population was not ready for. In my 'q' system new fish are kept for well over a month, and "sacrificial" koi are added from the pond to cross expose.
Thanks to this I found some new arrivals had chilodinella, making them flash like crazy. Had I not followed this process the entire pond would been exposed.
Additional note: scope and scrap will not always find someting on one fish, it may be resistant, so scape and scope multiple fish to be thorough.
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