The purpose of this study is to summarize the occurrence of incident serious medically
attended events and events of interest up to 1 year following MenACWY-CRM vaccination
administered as part of routine clinical care. This US FDA post-marketing commitment study is
an open-label, descriptive, epidemiological safety surveillance study of MenACWY-CRM vaccine
in subjects 2 to 10 years of age within a large US Healthcare Maintenance Organization. The
26 events of interest are events commonly evaluated in vaccine safety studies and include
certain neurological, immunological, vascular, musculoskeletal and hematologic disorders. All
events are collected retrospectively.