Figure 1.

Demonstration of baseline, control, and risk periods during follow-up. Patient A represents a patient with an AMI hospitalization identified in the post-IPD control period. Patient B represents a patient with an AMI hospitalization identified during a current IPD risk period (with IPD specimen collection date 1 day prior to date of admission for the AMI hospitalization). Patient C represents a patient with an AMI hospitalization during the pre-IPD control period. Abbreviations: AMI, acute myocardial infarction; IPD, invasive pneumococcal disease.