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		· Introduction · Emerging viruses and virus-like agents · Co-evolution of viruses and host defence mechanisms · Development of vaccines · Gene therapy · Acknowledgments · References
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Emerging viruses and virus-like agents
The emergence of new viruses is not uncommon, as Table 1 shows. New viruses can be assigned to two categories at least: (i) newly evolved ones, like the influenza virus H5N1 Hong Kong [22] or the porcine respiratory coronavirus (PRCV) [14, 19], and (ii) newly discovered ones, like the Australian bat lyssavirus [10], the porcine circoviruses type 1 [28, 29] and type 2 [2], or Nipahvirus [5]. It may remain obscure into which category a particular virus fits, and one may safely assume that there are many viruses out there, which have not (yet) been recognized as disease agents.

Table 1 Overview of some new viruses and year of recognition.

So why should we perpetuate the dogma that viruses are always disease agents? On the other hand, should we really consider some viruses harmless, only because we have not (yet) seen their association with disease?

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