Pneumococcal pneumonia is caused by pneumococcus or Streptococcus pneumoniae. Children under 5 years old and people over 60 years old are generally susceptible, accounting for more than half of hospital-acquired pneumonia. The lung segments or lobes show acute inflammatory consolidation, and patients have symptoms such as chills, high fever, chest pain, cough and bloody sputum. In recent years, due to the widespread use of antibacterial drugs, mild symptoms or atypical diseases are more common clinically. Children can be prevented through vaccines. Currently, the pneumococcal vaccines that can be vaccinated are 7-valent pneumococcal conjugate vaccine and 23-valent pneumococcal polysaccharide vaccine. Infants under 2 years old can only be vaccinated with 7-valent pneumococcal conjugate vaccine.