The number in the name of the vaccine tells how many strains (bacterial groups, also called serotypes) it protects against.

The CDC’s ACIP updated guidance on pneumococcal vaccination, recommending a single dose of PCV for all adults aged 50 years and older.

Antimicrobial resistance and serotypes in Streptococcus pneumoniae have been evolving with the widespread use of antibiotics and the introduction of pneumococcal conjugate vaccines (PCV).

Pneumococcal conjugate vaccines (PCVs) are known to provide protection against vaccine serotype pneumococcal pneumonia; uncertainty exists regarding the optimum PCV dosing schedule. Methods ...