• As Greenbank suggests, there's no screening that is specific and accurate enough - the incidence of false positives and false negatives, absent of anything symptomatic, meant that the cost - benefit just isn't there.

    If it were worthwhile, you can be pretty certain that event insurers would insist on screening as a condition of entry, rather than a self-certified waiver.

    That being said, it's grim to have someone die in the event you're in. I've run past a person dying in a marathon, and someone was pulled from the water in a tri.

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