人类。历史。恐怖传染病。夺5亿人生命
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人类漫长的历史中，我们遭遇了数不清的瘟疫灾难，其中有些特别严重，对人类后代影响十分巨大，如黑死病、天花、流感、非典等。总的来说，瘟疫是由一些强烈致病性微生物，如细菌、病毒引起的传染病。