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The massacre at a gay nightclub in Orlando on Sunday sparked calls from leading AIDS researchers and gay-rights advocates for the federal government to rewrite guidelines that bar men who have had sex with men in the past year from donating blood. (Piller, 6/12)

Hundreds lined up to give blood Sunday in Orlando to help the victims of the massacre at a gay nightclub, but major restrictions remain for gay men wanting to give blood themselves. The response overwhelmed OneBlood donation centers, where officials asked donors to make appointments and continue donating over the next several days. Over 50 people were injured and 50 were killed when a gunman opened fire early Sunday inside the downtown Orlando club Pulse. While many Facebook and Twitter posts from individuals and at least one gay advocacy group in Florida said no one would be turned away and all blood would be screened, OneBlood denied any change in policy. (6/12)