The term `Real Vampire` -Though the DNA in the host human has been greatly altered, the organism remains human in the medical sense, as the number of chromosomes have not been changed. The entire human race has the same number of chromosomes. The number of chromosomes is what separates humans and animals (except for those born with Down's Syndrome - these people have an extra copy of chromosome 21 but are, of course, human). It must be kept in mind that DNA can be altered in many ways. Many endogenous retroviruses can alter their DNA to become stronger and survive even more intolerable conditions. This is what happens with the human DNA with the vHERV endogenous retrovirus.
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(check this out at the vampire website.net)