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A​ 4-year-old boy in respiratory distress is sitting upright in bed and drooling. His mother states that he complained of a sore throat throughout the​ day, and tonight became severely short of breath and started drooling. He is alert with adequate breathing. His skin is very warm to the touch. Vital signs are​ pulse, 132;​ respirations, 28​ breaths/min; and​ SpO2, 90% on room air. Which is your first action in caring for this​ child?