Fatima, aged 4 months, presents because of noisy, wheezy breathing that developed overnight. This problem was associated with poor disinterested feeding and a possible fever. She had developed rhinorrhoea and a cough three days previously.

Past History:
Fatima is the first child of the family and has developed normally since birth and continued to breast feed. She has ahd a dry cough for the past four weeks. There is no family history of asthma.