Your take on vamps, real, or fake?

now i ask this question not only for opinions, but also for proof. i myself am not a believer of vampires, or immortality. i am a person who has to see with their own eyes. i have met people who swear up and down they have seen vampires, i have met people who wont even try to believe. i have no belief. but i ask this question maybe because i am wrong. i am a firm believer in science. throughout history, many diseases were confused for vampires. other theories have led me to believe they are not real. but i ask this question to give you people who do believe to show proof, or give me your take on vampires