Pneumococcal Disease is an infection caused by the bacterium Streptococcus pneumoniae. It can lead to serious illnesses such as pneumonia, meningitis, and bloodstream infections. This disease primarily affects young children, the elderly, and individuals with weakened immune systems. Vaccines are available to help prevent Pneumococcal Disease. The pneumococcal vaccine protects against many strains of the bacteria, reducing the risk of severe illness. It is recommended for infants, older adults, and those with certain health conditions to ensure better protection against these infections.