The purpose of this US FDA post-marketing commitment study is to evaluate the safety of MenACWY-CRM among 50.000 vaccinated adolescents within a large US Healthcare Maintenance Organization who received MenACWY-CRM vaccination as part of their routine clinical care. The pre-specified 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.
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Relative incidence (RI) for an Event of Interest (EOI) is calculated using the self controlled case series method. RI is the ratio of the incidence of an EOI in a pre-specified, event-specific risk window relative to the incidence in the control period.
Timeframe: Observational period of 1 year following date of vaccination of that individual.