Pneumococcal conjugate vaccine is a pneumococcal vaccine and a conjugate vaccine used to protect infants, young children, and adults against disease caused by the bacterium Streptococcus pneumoniae. There are currently three types of PCV available on the global market, which go by the brand names: Prevnar, Synflorix and Prevnar 13. Prevnar is a heptavalent vaccine, meaning that it contains the cell capsule sugars of seven serotypes of the bacteria S. pneumoniae, conjugated with diphtheria protei