steelhead, but it is deadly to trout and salmon in their infant stages.IHN is strictly a fish disease, so it has no impact on humans, birds or other warm-blooded animals that ingest the fish or are exposed to infected water.Special filters helped keep IHN-infected water out of the hatchery's hatch house, but tens of thousands of young rainbows died that year at Cole Rivers from IHN, Pease says.ODFW