Pneumococcal disease is an infection caused by the bacterium Streptococcus pneumoniae. It can lead to:

Streptococcus pneumoniae is spread through contact with a person who has the disease or who carries the bacteria in his throat. This most often occurs through droplets from the nose or mouth of someone with the infection.

There are two types of pneumococcal vaccines:

  • Pneumococcal conjugate vaccine (PCV)—recommended for infants and toddlers. The PCV13 vaccine, which protects against 13 types of pneumococcal bacteria, replaced the PCV7 vaccine.
  • Pneumococcal polysaccharide vaccine (PPSV)—recommended for certain children and adults

The vaccines are made from inactivated bacteria. It is given by injection under the skin or into the muscle. The goal of getting a vaccine is that later, when you are exposed to the bacteria, you will not get sick from it.