Pneumococcal vaccination and risk of myocardial infarction

A hospital-based case-control study that included patients considered to be at risk of myocardial infarction. Health databases were used to obtain hospital diagnoses and vaccination status. Patients who had been admitted for myocardial infarction were compared to those admitted to a surgical department in the same hospital for a reason other than myocardial infarction betwen 1997 and 2003.