In a patient infected with Ebola virus disease (EVD), how do the signs and symptoms usually present?

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	Signs and symptoms of EVD appear rapidly (within 48 hours following exposure) and develop quickly and all at the same time.
	Signs and symptoms of EVD appear 2-21 days following exposure and develop over the course of several days, becoming increasingly more severe.
	Signs and symptoms of EVD appear 4 weeks or more following exposure and develop quickly and all at the same time.
	Signs and symptoms of EVD appear within 2-21 days following exposure and develop over the course of several days, becoming less severe as time passes.