You can know whether a person is infected with streptococcus by clinical manifestations and bacterial culture. Streptococcus can attack several tissues and organs in the human body, causing different clinical manifestations. When it invades the pharynx, patients will have sore throat and tonsil pus; when it invades the lungs, patients will cough, cough up sputum, chest pain, etc.; when it invades the endocardium, patients will have fever, fatigue, chest pain, etc.; when it invades the tissues and joints, patients will have redness, swelling, heat and pain of the joints and impaired mobility. Bacterial culture + drug sensitivity test can be carried out by taking pharyngeal secretion, sputum and blood of the patient. If streptococcus is cultured in the specimen, streptococcal infection can be diagnosed, and relatively sensitive antibiotic drugs can be adjusted according to the drug sensitivity test for treatment. It is recommended that patients with the above symptoms should consult a doctor for examination, and follow the doctor’s instructions for treatment after clarifying the cause of the disease.