I have HPV-18. I have been cleared of all the other major STDs. I'm on my 2nd Gardasil Shot. Will HPV-18 go away or will I all ways have it?

Have it. HPV is a large family of viruses well known for their potential to hide in your tissues for life. The primary infection will clear in a couple of years but it can hibernate. The vaccine helps protect against strains you do not have but does not treat or clear what you do.