有可能蔓延或引发流行病的。
引发了1918年流行病的病毒最初只导致了轻微的疾病，但随着后来的进化，原本健康的人也会因它而很快致死。
The virus responsible for the 1918 pandemic caused only mild disease at first but evolved in ways that made it able to quickly kill previously healthy people.
H1N 1流感病毒逐渐蔓延，并迅速恶化为全国性的流行病。一个32岁的甲流患者不幸引发了阑尾炎并发症，他同时还患有囊肿性纤维化症。
A 32-year-old man with cystic fibrosis is rushed to the hospital with appendicitis in the midst of a worsening pandemic caused by the H1N1 flu virus, which has mutated into a more deadly form.
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