Unfortunately any search I do with sorority and Merck comes up with the DZ issue (on news pages discussing both) or this thread
Hadn't heard. But college students are a common target for drug trials.. it's a good way to make money. My roommate has a smallpox vaccine for it, and possibly a herpes vaccine (not sure if she did that one). And since this is targeted at women, sororities would be a good contact point.