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Question: 1 / 400

What defines a Mass Casualty Incident (MCI)?

Any scene involving two or more patients

More than five vehicles in an accident

Two or more injured patients that need rapid transport to the hospital

Any incident in which local resources are stressed

A Mass Casualty Incident (MCI) is primarily characterized by an event that overwhelms the immediate resources available to respond effectively to the situation. This includes the number and condition of patients—often exceeding what local emergency services can manage without additional assistance. While multiple patients or vehicles can be involved in an MCI, the defining factor is the impact on the local emergency response capabilities.

When an incident happens that requires more resources than are readily available—whether in personnel, equipment, or transport capability—it meets the criteria of an MCI. This definition emphasizes the strain on local resources rather than just the number of people involved or the nature of their injuries. Hence, option D captures this fundamental characteristic of an MCI effectively, distinguishing it from scenarios that may involve multiple patients but do not necessarily stress the local emergency response system.

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