Pam
Not everyone. Just to the people here who were nabbed by the Seal. Vampires don't really make the evening news. Well, I know we have a genuine vampire slayer. Enhanced strength and all that. Also people who know all the vampire lore. They call themselves hunters. If you're careful none of that should be a serious problem.
Vervain is an herb some of us are sensitive to. If a human ingests it their blood becomes poisonous to us. It also keeps us from being able to compel said human.