I found this on a recent post from Siobhan Champ-Blackwell on the BHIC blog.
Don’t Twitter? That doesn’t mean you have to miss out on the words of wisdom that filter through the more than 50 HHS Twitter streams. With one visit to this site, created by Ignite Health’s Fabio Gratton, you can check in with the National Institutes of Health, Centers for Disease Control and Prevention, Food Safety.gov and many more. The National Libraryof Medicine has several twitter sites listed on this page, including medlineplus4you, nlm_newsroom, and NLM-SIS