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Viruses are probably the most common infectious agents,
though no exact figures exist to support this contention. As a
group, they are all obligate parasites and infect not only
animals and plants but also other microorganisms. Every time a new
virus or viral disease is discovered or a connection is made between a
virus and a once-unexplained disease, our understanding of these
remarkable infectious particles is increased, and we are reminded of
their power. This chapter covers viral diseases of the viral groups most
significant to humans and their epidemiology, pathology, and methods
of control, with special emphasis on DNA viruses. Chapter 25 covers
RNA viruses.
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