Human nail dust: hazard to chiropodists or merely nuisance?

This survey was carried out in response to anxiety among chiropodists as earlier reports had raised the possibility of respiratory damage as a result of sensitization to trichophytons. Questionnaires were sent to 327 chiropodists and 168 replies were received. The aim was to investigate respiratory symptoms and their relationship to work and drill usage. All of those completing questionnaires were invited to attend the occupational health department for prick tests and lung function tests. Just over one half of those who were invited attended. Although upper respiratory symptoms were common, only eye symptoms and wheeze were significantly more prevalent in those who used non-vacuum drills. Nasal symptoms were commoner in those who had spent less than ten years in the profession. Throat symptoms and multiple symptoms occurred more commonly in the 17 per cent of attenders who had positive prick tests to trichophytons. There were no cases of occupational asthma and no definite relationship between any symptom and work. It was confirmed that sensitization to trichophytons was common (16.5 per cent) but did not produce chest problems. Nail dust might produce symptoms by simple irritation of the upper respiratory tract.