A study of indigenous children in three countries has found that sending nurses into family homes made more difference than medicines for children with severe lung problems.
Maori and Pacific children in New Zealand, Aboriginal children in Australia and Native American children in Alaska are all admitted to hospitals with "lung scarring", or bronchiectasis, at rates that are many times the average for developed countries.
New Zealand researchers have reduced the infection by 75 per cent in 42 families where nurses have visited their homes once a week for a year to make sure the children took their medicines.
But Auckland University paediatrician Dr Cass Byrnes, who led the New Zealand research team, said Australian researchers using the same medicines did not reduce infection because they did not directly observe children taking them.
Results from Alaska are not yet in.