Pneumocystis carinii pneumonia can be divided into epidemic infantile type and child-adult type. Epidemic infantile type causes clinical manifestations such as diarrhea, low-grade fever, cough, etc., while child-adult type will cause high fever, shortness of breath, cyanosis and other clinical manifestations. 1. Epidemic infantile type: Epidemic infantile Pneumocystis carinii pneumonia, also known as classical Pneumocystis carinii pneumonia, is characterized by a slow onset of the disease, with low-grade fever, diarrhea, and fear of food in the early stage of the disease, and coughing and respiratory distress as the disease progresses. 2. Child-adult type: also known as the modern type of Pneumocystis carinii pneumonia, the onset of the disease is relatively acute, the onset of the disease will occur dry cough, followed by rapid onset of high fever, cyanosis, and shortness of breath and other clinical symptoms. Seek medical attention when symptoms are suspected to avoid delay.