Measles is an acute respiratory infection caused by measles virus, characterized clinically by fever, inflammation of the upper respiratory tract, conjunctivitis and red papules on the skin and mucous membrane spots on the buccal mucosa, leaving pigmentation with bran-like desquamation after the rash recedes. 1. fever: in most cases a moderate fever, about 38°C, in a few cases a high fever, 39-40°C. 2. upper respiratory tract Inflammation: The manifestation is a cough, usually with little sputum, and if it causes pneumonia, yellow sputum or pus sputum may also appear. 3. Rash: Red papules may appear on the skin, and the conjunctiva of the eyes may appear congested, showing the manifestation of conjunctivitis. In addition, a rash can appear on the oral cheek mucosa, and after the rash subsides, pigmentation will also appear, with very small rice bran-like flakes on top, which is a more typical rash performance.