How do i get rid of the virus on my HA to get a new one? Thanks in advance! :)

If you're at the stage 8. Go to the Beta Wardrobe, click the "SKIN" tab. Deselect your Deathslug skin and pick "NONE" to be human again.
Then you go back to the VIP lounge, select your other virus and wait for someone to bite you.
There seems to be a bug right now with new viruses.
http://subeta.net/forums.php/read/826725/Do-not-want-to-be-infected-anymore (more in the bug & glitches section).
I'd advice you to stay human or with your current virus for now until they fix it.