Invasive pneumococcal disease among infants before and after introduction of pneumococcal conjugate vaccine

A test was conducted to determine the rates of invasive pneumococcal disease (IPD) in young infants before and after pneumococcal conjugate vaccine (PCV7) was incorporated into the childhood immunization schedule. It was seen that since PCV7 introduction, rates of IPD in young infants have decreased significantly, providing evidence that vaccinating children aged 2-23 months has led to change in pneumococcal carriage in infants too young to receive PCV7.