Adverse events temporally associated with immunizing agents.

In Canada during 1990, a total of 2832 reports of adverse events temporally associated with the administration of immunizing agents were received by the Childhood Immunization Division of the Laboratory Centre for Disease Control. This paper summarizes the data collected, describes the surveillance system, and demonstrates that, with more than 12,000,000 doses of vaccines distributed during 1990, the incidence of adverse events reported is very low.