The University of Michigan began planning for an influenza pandemic 3 to 4 years ago. At the time, planners noticed that there was a lack of clear guidelines about the storage and use of droplet protection, such as masks, respirators, and gowns, said Robert Winfield, MD, Director of the University Health Service and Chief Health Officer of the University of Michigan. The University of Michigan Health System hospital had begun to stockpile masks and respirators.