Which of the following describes signs of Blue Tongue disease?

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Blue Tongue disease presents with vascular injury leading to fever and mucosal damage. In affected ruminants, you typically see fever and nasal discharge, along with edema and necrotic lesions of the oral mucosa—the tongue is often swollen and discolored, and the gums and lips can have necrotic lesions. As the disease progresses, lameness can appear due to damage to the feet and joints. This combination—fever, nasal discharge, oral mucosal swelling and necrosis, with possible later-stage lameness—best matches bluetongue.

Other descriptions don’t fit as well because they lack the characteristic oral mucosal involvement or systemic signs: a primarily coughing/pneumonia picture points to a respiratory issue; diarrhea alone misses the oral lesions and systemic mucosal damage; and no oral lesions contradicts the hallmark bluetongue presentation.