Why is the 13-valent vaccine more recommended than the 23-valent vaccine? Pneumococcus is a common pathogenic bacteria that can cause a variety of diseases, such as pneumonia, otitis media, meningitis, etc. To prevent the disease caused by this germ, a pneumonia vaccine was developed. Currently, there are 13-valent vaccine and 23-valent vaccine on the market, but the 13-valent vaccine is more recommended than the 23-valent vaccine. Why is this? 13-valent vaccine