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If my OPINION, is correct and the fish has Columnaris, the following information taken from Blue Ridge Hatchery, may be helpful. I've recently read several articles on Koiphen ( a site dedicated solely to Koi and has a medical committee ) about good results with Oxolinic Acid. I don't know if it's available to you or not. Sadly, if it is Columnar, as opposed to Ich, the other mentioned treatments will not work and you could be looking at some of your other fish contracting it.
"So what can you use? Look for medications with antibiotics in them. Nitrofurazone, Furazolidone, Tetracycline and Oxolinic Acid have been known to be effective. We have found that Nitrofurazone seems to work the best. Whatever you choose, be sure to follow the recommended dosage and instructions carefully. Overdosing a pond or aquarium can result in complete losses." Blue Ridge Hatcheries
If it were my koi, I'd go to Koiphen.com and ask for help, but only my OPINION. Best of luck.
"So what can you use? Look for medications with antibiotics in them. Nitrofurazone, Furazolidone, Tetracycline and Oxolinic Acid have been known to be effective. We have found that Nitrofurazone seems to work the best. Whatever you choose, be sure to follow the recommended dosage and instructions carefully. Overdosing a pond or aquarium can result in complete losses." Blue Ridge Hatcheries
If it were my koi, I'd go to Koiphen.com and ask for help, but only my OPINION. Best of luck.