The virus is perpetuated in the cat population in three main ways ( See Picture )

  1. By contact spread from acutely infected to susceptible animals; this depends on sufficient numbers of susceptible animals in the population and sufficient opportunities for contact between them.
  2. By persisting in the recovered cat, i.e. immune carriers.
  3. By persisting in the environment.

Of these, (1) and (3) are by far the most important.

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