Dr. Kelso: Look, infection can start with a simple sneeze. And then a handshake. Perhaps an accidental collision. Then a simple touch on the shoulder.
[As Dr. Kelso speaks, the camera turns to a young boy who sneezes. As his mother wipes his nose, the tissue she throws away glows green, as does her hand. She then shakes hands with a doctor, turning his hand green. He bumps into a nurse who helps him pick up his file, turning her hand green. The nurse then strokes the arm of a patient, turning her arm green.]
Dr. Kelso: And just like that you have a patient in trouble.