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accompanied

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be present or occur at the same time as (something else)

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fatalities

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an occurrence of death by accident, in war, or from disease

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regimen

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a prescribed course of medical treatment, way of life, or diet for the promotion or restoration of health

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periodically

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at regularly occurring intervals

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approximately

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used to show that something is almost, but not completely, accurate or exact; roughly

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criteria

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a principle or standard by which something may be judged or decided

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recurrence

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the fact of occurring again

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dormant

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temporarily inactive or inoperative

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deteriorate

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become progressively worse

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abundance

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a very large quantity of something