This chapter discusses several issues concerning viruses. These include the increasing threat to humans posed by viruses, the settlement of virus families in the population, and the spread of viruses when their hosts are older. The chapter also discusses the fact that viruses spread easily when dependant upon the conditions under which a host lives or is forced to live. Viruses destroy life and protect it at the same time, and the failure to defend against virus invasion with vaccines reduces the chances for survival of many people on several continents.
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