Hey you guys, it's VSH, not VHS. 

> It's not often in life that an idea comes along that is so good that it can change the world. The development of VSH bees which can reduce Varroa mite populations without chemical treatments is just such an idea. The result of over a decade of research by some of today's brightest honeybee scientists, VSH is making a difference in the apiaries and lives of beekeepers all across America.

http://www.glenn-apiaries.com/vsh.html

> VSH is an important mechanism of resistance to varroa mites. The best resistance is found in pure VSH bees. However, hybrid VSH bees (e.g. VSH queens open mated to non-resistant drones) also have significant resistance to varroa mites.

http://www.extension.org/pages/30361/varroa-sensitive-hygiene-and-mite-reproduction

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