Malignant catarrh is a term that refers to a severe and often fatal respiratory disease in animals, particularly cattle and sheep. Some synonyms for malignant catarrh include bovine respiratory disease complex, shipping fever, and pneumonic pasteurellosis. These terms refer to similar respiratory diseases that can manifest in a similar way to malignant catarrh. Symptoms often include fever, labored breathing, coughing, and nasal discharge. It is important for farmers and veterinarians to be aware of these synonyms so they can identify and treat the disease immediately to prevent further spread and mortality among their livestock.