Why are viruses important?
Viruses are known for the diseases they cause. They are pathogens
of bacteria, plants, and animals. Some viruses are deadly, such as the
fast-acting Ebola virus, which can
have a mortality rate of more than 85%, and the slow-acting but equally deadly human immunodeficiency virus (HIV),
which causes acquiredimmunodeficiency
syndrome (AIDS). Other viruses might be simply annoying,such as rhinovirus, which causes common colds.
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