Most people think viruses would kill a mess of fish, or, on the other end of the spectrum, that viruses do not matter in Koi Health.

Both would be wrong. Carp Pox, for example, pictured at left, won't kill a fish unless it prevents them from eating (literally proliferates to wreck their mouths) and Koi Herpes Virus, on the other hand will kill 95% of exposed Koi.

So, understanding viruses could have some utility.

Koi herpes Virus Primer
The basics of Koi Herpes Virus with a little discussion of Spring Viremia of Carp, thrown in. I'd suggest browsing this first. Once you have the jist of KHV, read the following which deal with most of the "other" aspects of KHV including treatment, etc.

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Koi Beginner Once you've leapfrogged through this tutorial you will have a solid, working concept of the Koi hobby and what it's all about. This is done just about exclusively with video and very little written material.	DrJohnson.com More than koi health, this site spans all things animal, by a real veterinarian who shoots you straight.	Fishdoc.co.uk By Frank Prince-Iles. A UK authority who put this site together some time ago and which is still relied upon as a major source of good Koi and pond fish information
	PondCrisis.com If you have a koi, pond or fish problem, this site takes you through twenty easy questions and at the end you know what you need to fix in your pond to create restored Koi health.