In recent months, there has been a great deal of controversy surrounding the HPV vaccine. Many medical organizations and states/local governments recommend that young girls (I believe 12 and up) get the vaccine to protect against this STD regardless of whether they are sexually active or not.
Don't click the link yet.
Here is a good reason for the vaccine. An Indonesian fisherman injured himself as a teenager and picked up an HPV infection. Sure, this is apparently a different strain that was transited when the victim cut his knee, but it is still HPV. The HPV infection interacted with his unique genetic flaws and is turning him into a tree.
Bizarre warts that look like roots and branches are growing from his skin.
The video and pictures at the site may be disturbing if you are sensitive to that sort of thing. Consider your self warned.
The good news is this may be treatable.
I originally found the link on fazed.net, and I really hope it's a fake. Unfortunately, it seems all too real.
Regardless of how HPV is transmitted, if the vaccine will stop this sort of thing from happening, it's probably worth it