Sheep scab is a disease caused by the mite Psoroptes ovis, which lives on the skin surface where it feeds. The faeces produced by the sheep scab mite cause a severe allergic dermatitis, resulting in the ‘scabby’ lesions which we associate with the later stages of the disease. Rachel Mallet at Bimeda discusses how in spite of having four medicinal active ingredients available with 16 different brands licensed and available in the UK, they are still struggling to get this disease under control.