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Viruses: the ultimate invaders

Among infectious microbes, viruses are particularly fascinating—and challenging. They pose a number of vexing problems to those trying to fight infectious disease, and to those of us who must live with them. Unlike other types of germs—say, bacteria or fungi—a virus can’t live independently. Instead, it must invade a host cell to live and reproduce. Because viruses live inside human cells, it is more difficult to create drugs to fight them than it is…

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