Edward is 9 months old and is brought in by his mother Samantha to the GP surgery. She is concerned as he has been wheezy for several days with a runny nose but today also has a cough and fever of 37.8°C. His older brother has Asthma. He is maintaining his usual oral intake and is otherwise a happy child. On chest examination he has mild bilateral wheeze and crackles. Respiratory rate is 45 breaths per minute with other vital signs unremarkable.
Which of the following features is not typical in Bronchiolitis?