12 CLINICAL PHARMACOLOGY
12.1 Mechanism of Action
Protection against pneumococcal disease is conferred mainly by opsonophagocytic killing of S. pneumoniae. Prevnar 20 generates functional antibodies as measured by opsonophagocytic activity (OPA).
The effectiveness of Prevnar 20 was assessed by measuring serotype-specific serum OPA of antibodies at 1-month post vaccination.
An opsonic antibody titer that is predictive of protection against invasive pneumococcal disease or pneumococcal pneumonia has not been established.