PCV13, or Pneumococcal Conjugate Vaccine 13, is a vaccine designed to protect against 13 types of Streptococcus pneumoniae bacteria. These bacteria can cause serious infections, including pneumonia, meningitis, and bloodstream infections. The vaccine is recommended for infants, young children, and certain adults, especially those with weakened immune systems. The PCV13 vaccine is typically administered in a series of doses during childhood, starting at 2 months of age. It helps the body build immunity against these harmful bacteria, reducing the risk of severe illness. Vaccination is an important public health measure to prevent pneumococcal disease.