system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] When and how did Jubilee become a vampire?

And if possible why?
gpt
This really isn't what the sub is for, exactly, but...

*When* - X-Men volume 3, 2010

*How and why* - vampire suicide bomber blew himself up near her, she got infected by vampiric blood. Then she got bitten by Xarus (Dracula's son) and fully turned.