epidemic

noun

a widespread outbreak of an infectious disease
感染症の広範囲の発生

many people are infected at the same time
多くの人々は、同時に感染している

adjective

(especially of medicine) of disease or anything resembling a disease
病気に似た何かまたは病気の（特に医学的な）

attacking or affecting many individuals in a community or a population simultaneously
同時に、地域社会または住民の多く人々を襲うまたは侵す
- an epidemic outbreak of influenza
  インフルエンザの集団発生

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