必须记住，人类历史上很多严重的传染病均起源于动物。
Many serious infections in human history have originated in animals.
它是由于感染了人类免疫缺陷病毒后引起的一种致死性传染病。
It is due to infection of human immunodeficiency virus after a fatal infectious disease.
志贺氏菌是最常见的肠杆菌科的病原菌，可引起人类肠道传染病。
Shigella, the most regular pathogen in Enterobacteriaceae, could easily cause human enteric infection.
结核病是一种严重危害人类健康的慢性传染病。
TB is a serious harm to human health of chronic infectious disease.
结核病是一种严重危害人类健康的慢性传染病。
TB is a serious harm to human health of chronic infectious disease.
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