Merck also sells an older shot called Pneumovax 23, which covers 23 serotypes but is based on an older polysaccharide technology that does not stimulate the immune response as strongly as the ...

PNEUMOVAX 23 contains a mixture of inactive parts from 23 of the most common types of pneumococcal bacteria. PNEUMOVAX 23 is a vaccine given to help prevent infections caused by certain types of ...

NA: Not applicable; PCV-7: 7-valent pneumococcal conjugate vaccine; PCV-13: 13-valent pneumococcal conjugate vaccine; PPV23: 23-valent pneumococcal polysaccharide vaccine.

Adults 19 years and older who received a previous dose of pneumonia vaccine Prevnar 13 or a complete series of Pneumovax 23.