Cases of Mycoplasma bovis in the UK have soared in recent years; it’s the main cause of pneumonia in calves and is extremely difficult to treat. As Mycoplasma bovis is a bacterium which doesn’t have a cell wall, it does not respond to some common antibiotics. The most common presentation of Mycoplasma bovis is respiratory disease in calves but it can also cause a plethora of other symptoms, including mastitis, arthritis, immunosuppression and otitis. Ruth Willis at Agrihub explains why prevention is better than cure, highlighting how stringent biosecurity is a must, to counteract this multi-factorial disease in young and adult cattle.