The common pathogens of community-acquired pneumonia are bacteria, so community-acquired pneumonia often requires antibiotic therapy, often in combination with two or more antibiotics, sometimes in combination with antiviral therapy. The pathogens of community-acquired pneumonia include bacteria, viruses, mycoplasma, chlamydia, rickettsia and other microorganisms. The main symptoms include cough, sputum, fever, chills, chest pain, and in some patients, prodromal symptoms such as nasal congestion, runny nose, sore throat, headache, dizziness and hoarseness. Community-acquired pneumonia refers to pneumonia caused by pathogens that infect the patient outside the hospital, but not all of them arise outside the hospital; pneumonia that results within 48 hours of the patient’s hospitalization is also considered community-acquired pneumonia.