Association of infant pneumococcal vaccination with pneumococcal pneumonia among mothers: A nested case-control study using the GPRD

► After PCV7 implementation in the UK, pneumococcal pneumonia in mothers increased. ► By 24 months of age, 35% of infants had incomplete PCV7-series in 2010. ► Pneumococcal pneumonia in mothers was associated with their infants PCV7 status.