There's a secondary issue to HIV for Jews. We get kosher only blood from blood banks, because the blood affects your behaviour. Rabbi Mizrachi told a story of an Orthodox Jew who took blood from a black friend, and all of a sudden loved rap and cheap foods that many black Americans are wont to consume. Blood is the soul of a person, and I would take it to save my life, since I wouldn't have permission not to, but I'd do everything in my power to avoid this.