Bactokill Orf Paste is used to control Orf in sheep and lambs. Orf is caused by Parapox virus, causing scabs and lesions on the non-wool areas of sheep typically gums mouth and udders. Orf effects mostly lambs in the spring time as they have little or no immunity to the disorder. Using gloves apply Bactokill Orf paste by rubbing onto the affected areas on all animals showing signs. Use four days apart until signs the orf has disappeared.