PATTERN UPDATE

  For reload of pattern files after updated via freshclam, the packages
  installs an update script within /etc/clamav/onupdateexecute.d/ as 
  libc-icap-mod-virus-scan.
 
  The feature in freshclam isn't activated by default or by this package.
  To enable this feature you will have to add to /etc/clamav/freshclam.conf:

  OnUpdateExecute /bin/run-parts --lsbsysinit /etc/clamav/onupdateexecute.d/

  For further information please have a look in the doc directories of the
  clamav packages.