When someone checks into a hospital or hotel, the last thing on their mind is the sheets they’re lying on. But those sheets have the potential to be deadly if they aren’t properly washed between patients or guests. This week on Take Care, Dr. Philip Tierno , Clinical Professor in the Departments of Microbiology and Pathology at the NYU School of Medicine and author of " The Secret Life of Germs: Observations and Lessons from a Microbe Hunter " discusses what might be hiding out in the bedsheets