she had charted the social relationships of the infected UCSB students. At the top of the board she had written “Cross-Pollination,” a term of art she’d picked up from Dr. Hosea. “It’s when you don’t want to say ‘he had sex with her’ and what kind of sex they had,” she said. “But I was basically trying to figure out who had shared saliva with whom, and where they’d shared it.” All signs pointed to the Greek system. She decided to shut down the college sororities and fraternities and give the twelve hundred students in them a prophylactic drug. “With meningitis B you have a very narrow window
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