In the proper doffing sequence to minimize contamination, which action is performed last?

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The sequence for doffing PPE is designed to minimize transferring contaminants to skin and mucous membranes by removing items in a way that keeps the most contaminated surfaces controlled as long as possible. The respirator or mask is kept on until the end because its front is most likely to be contaminated with respiratory droplets; removing it last helps prevent touching contaminated surfaces or your face. You take off other gear first—gloves, then gown, then eye protection—so you reduce the likelihood of spreading contamination during removal, and you handle the mask by its straps rather than the contaminated front. After all PPE is off, you perform hand hygiene. So, the action performed last among the options is removing the respirator/mask.