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A 7-month-old boy has had a runny nose for three days and is now coughing, wheezing and breathing fast. This is his first such illness. Respiratory rate is 58 per minute with subcostal recession, there are widespread wheeze and fine crackles throughout both lungs, and oxygen saturation is 94 per cent in air. He has taken about three-quarters of his usual milk over the last day and has had five wet nappies. His mother says his 3-year-old brother had exactly this last winter and was much better after a blue puffer. Which one of the following should this infant receive?
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