Uncomplicated and non-progressive ovine interdigital dermatitis is due to superficial infection of skin with F. necrophorum. It predisposes feet to subsequent infection with D. nodosus (Egerton et al., 1966; Parsonson et al., 1967). Ovine interdigital dermatitis is clinically indistinguishable from the early stages of footrot, when lesions are confined to the interdigital skin, i.e. Score 1 of footrot.
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Footrot @ Sydney 