#3 and #2 are very nice, but need a graphic of the virus. Please refer to http://hhv-6foundation.org/wp-content/images/hhv6_cg.jpg for a graphic of the virus, but use your own color scheme. We would love to see this logo in a more subtle color scheme.
#33 is the best combination of graphics and typography, but the monochrome blue isn't compelling enough. The virus graphic could use a little more depth and color, as it looks like fireworks, not a virus. We love the look of the #2's separated letters, but prefer the "-" and the "6" from #33. Thank you very much for making these changes!