No.

This is probably a good question for askavampirologist. I think some people think they are vampires for religious/physical/other reasons… I think there are probably diseases that simulate vampiric symptoms (light sensitivity, etc.). 

It does somewhat comfort me in an odd way that if there WERE vampires, they wouldn’t truly be immortal, because the Earth is headed for the sun eventually, so unless they coordinate with NASA to ship themselves (and a starter pack of humans and animals to feed from) somewhere safer, they’ll end up as dead as us, too!