Texas blood donors (and probably donors elsewhere); also, medical abuses horror story.
amberfox just heard that the Dallas area is dangerously low on O- and B- blood. So, if you're able, the vampires need you.
Edit: the BBC was hoaxed.
Not blood-related per se, but medical: ataniell93 found an article about HIV+ children under the care of the local government being subjected to drug trials without even the semblance of informed consent. WARNING: This is triggery as fuck, and the sort of thing you'd expect to read about in a country known for its public far-reaching human rights abuses, not NEW YORK FUCKING CITY. Even if you don't have the past to be triggered by same, it makes for very unhappy reading.