Why is the pneumococcal conjugate vaccine given?

Pneumococcal conjugate vaccine is given to prevent the spread of diseases caused by pneumococcal bacteria. These bacterias are responsible for illnesses like pneumonia. You can read about the Zoonotic Diseases – Definition, Types, and how they spread in the given link.

Further readings:

1. Science & Technology Notes For UPSC – General Science Notes 
2. Science & Technology Questions in UPSC Mains GS-3