Orf (contagious pustular dermatitis) in farmworkers: prevalence and risk factors in three areas of England

Orf is a zoonotic skin disease which is commonly self-diagnosed by those wh o tend sheep and goats. This paper reports the prevalence, incidence and ri sk factors associated with the infection in a cohort of farmworkers from th ree areas of England, derived from the results of self-reporting and serolo gy. Twenty-three per cent of those employed or living on a sheep farm repor ted ever having had orf, and the antibody serological profiles indicated a prevalence of 4 per cent and an annual incidence of 2.8 per cent. The main risk factors associated with the infection were contact with sheep, the siz e of the sheep flock, and contact with dogs.