Pneumonia can be divided into many types, including viral pneumonia, bacterial pneumonia, and those caused by special bacteria such as tuberculosis bacillus, and atypical bacteria such as Legionella, Mycoplasma, Chlamydia, etc. Generally, pneumonia does not cause large-scale disseminated transmission, because most people have normal immune systems that can resist these less virulent bacteria; however, in populations with lower immunity, inhaling droplets from patients with bacterial pneumonia can potentially lead to pneumonia. However, pneumonias caused by "SARS", anthrax, pneumonic plague, etc., are highly contagious and can cause large-scale transmission through droplets, and these are strictly controlled infectious diseases in our country. In cases of open tuberculosis, the patient's sputum and cough droplets might contain the pathogen, which could then infect those in close contact. Infectious pneumonia typically has an abrupt onset, with an incubation period of 2-10 days, and fever as the initial symptom, generally above 38℃, possibly accompanied by chills, coughing, scant sputum, occasional bloody sputum, palpitations, shortness of breath, and in some cases, difficulty breathing. It may also be accompanied by muscle soreness, headaches, joint pain, fatigue, and diarrhea.