Table 3

 Aetiology of confirmed cases

Aetiology% (n)
Unknown/idiopathic54 (35)
Post infectious22 (6 adenovirus, 3 pertussis, 1 tuberculosis, 4 other)
Post oncology11 (5 leukaemia, 2 lymphoma; 1 had bone marrow transplant)
Aspiration6 (3 chronic aspiration, 1 retained peanut)
Primary immunodeficiency6 (4, all humoral deficiencies)