The Gulf Study Four Years after the Deepwater Horizon Oil Spill:
The National Institute of Environmental Health Sciences (NIEHS) Gulf Long-term Follow-up Study (GuLF) is a long term health study with over 100,000 participants composed of oil spill cleanup workers and volunteers who responded to the April 2010 explosion of the Deepwater Horizon oil rig in the Gulf of Mexico. The NIEHS held a teleconference on April 11th to update members of the media, the public and study participants on the progress of the study. This post provides a summary of the call, including a review of progress made and preliminary observations. Go to: http://www.niehs.nih.gov/news/newsletter/2014/5/spotlight-gulf/index.htm
UPDATE: See the comment section for an additional recommended source of information.
One more source of information about the general recovery from the major spill incident is this recent CRS report.