Mould linked to worsening asthma
04 April 2007

Exposure to indoor mould could lead to people’s asthma symptoms worsening, according to research supported by Asthma UK.

In a study, conducted by Dr Michael Burr at Cardiff University, 182 participants, aged 3-61, had their homes assessed for the level, type and distribution of mould present in their household.

Some participants were then selected at random to have mould prevention treatment in their homes. Throughout the study, the asthma symptoms of each participant were assessed, using standard questionnaires and measurements of lung function.

Those who had indoor mould eradicated from their home reported an improvement in their asthma symptoms. In particular, they reported improved breathing and a significant reduction in use of their reliever inhalers. Measurements of lung function, however, did not show a significant improvement upon the removal of mould.

In addition to Dr Burr’s research, a recently published Finnish study suggests that children who have been newly diagnosed with asthma are more likely to have been exposed to moisture damage and mould growth in their homes than children who have not.

Dr Burr said: 'Together with existing evidence, this suggests that mould probably triggers respiratory symptoms and may contribute to causing asthma. However, it is not possible to distinguish conclusively between the role of moisture damage and mould as trigger factors, and any causal link with childhood asthma based on the current evidence.'

Jenny Versnel, Asthma UK’s Executive Director of Research and Policy said: 'These studies add to the increasing bank of research that indoor mould may have a link with asthma, however more work is needed in this area before definitive conclusions can be drawn.

'Research into this area does, however, highlight the importance of keeping your house dry and well ventilated. This can reduce exposure to certain asthma triggers such as mould spores which are found in damp places.'