Two sets of gloves, A and B. Each has an "inside" and an "outside", but they can be turned inside out. (There's an assumption here that you can put them on/take them off without really "touching" any possibly infected surfaces.)
Doctor 1 wears both sets, A on the inside and B on the outside. A-inside is now contaminated by Dr. 1, and B-outside by the patient. A-outside and B-inside are still clean.
Doctor 2 wears set B, contaminating B-inside. B-outside is still contaminated by the patient, but it's only touching the patient.
Doctor 3 turns set A inside out, putting them on first before putting on set B. He's only touching A-outside, which is clean; A-inside and B-inside are contaminating each other, but that doesn't matter. The patient is still only touching B-outside.
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Date: 2009-05-08 07:33 pm (UTC)Doctor 1 wears both sets, A on the inside and B on the outside. A-inside is now contaminated by Dr. 1, and B-outside by the patient. A-outside and B-inside are still clean.
Doctor 2 wears set B, contaminating B-inside. B-outside is still contaminated by the patient, but it's only touching the patient.
Doctor 3 turns set A inside out, putting them on first before putting on set B. He's only touching A-outside, which is clean; A-inside and B-inside are contaminating each other, but that doesn't matter. The patient is still only touching B-outside.