Paediatricsmiddle twist
A 16-month-old girl who arrived in Australia from overseas six months ago is brought to a general practice because she is not gaining weight. Her weight has fallen from the 25th centile to below the 3rd since solids were introduced at six months. Her stools are pale, bulky and greasy and float in the bowl. She has needed antibiotics for three chest infections since arriving and has a moist cough between them. Her mother says she tastes salty when kissed. Which one of the following is the most likely diagnosis?