I believe this announcement probably comes in the wake of the death of a University of Minnesota student from the disease.
http://www.mndaily.com/article.php?id=5389
She was a Gamma Phi Beta. I attended the U of M last year and while I did not know her, we had mutual friends. Everybody thought they'd caught the disease early enough that she would pull through, but unfortunately she didn't.
I was going to post here and remind y'all to watch out for this, so I'm glad you brought it up -- it can get dangerous really quickly, and those living in dorms or Greek housing are obviously at increased risk . . . don't let this happen to someone from your chapter!