Some human diseases are apparently caused by the body's response to virus infection: immune reaction
to altered virus-infected cells, release by infected cells of inflammatory substances, or circulation
in the body of virus-antibody complexes are all virus-caused immunological disorders. Viruses cause many
diseases of economically important animals and plants, some transmitted by carriers such as insects.
A retrovirus ( HIV ) causes AIDS, several viruses cause particular forms of cancer in humans, and many have
been shown to cause tumors in animals. Other viruses that infect humans cause measles, mumps, smallpox,
yellow fever, rabies, poliomyelitis, influenza and the common cold.
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