AVIRA Antivir

antivir --allfiles --scan-in-archive $FILESDIR

------ scan results ------
   directories:        1
 scanned files:     5103
        alerts:     4939
    suspicious:        0
      repaired:        0
       deleted:        0
       renamed:        0
     scan time: 00:02:03
--------------------------
Thank you for using AntiVir.

Antivir got 4939 files out of 4987 which would give a result of about 99,04%
Sophos SWEEP

sweep -f -all -nremove -archive $FILESDIR

4987 files swept in 14 minutes and 34 seconds.
1 error was encountered.
3423 viruses were discovered.
3420 files out of 4987 were infected.
Please send infected samples to Sophos for analysis.
For advice consult www.sophos.com, email support@sophos.com
or telephone +44 1235 559933
End of Sweep.

Sophos got 3420 files out of 4987 which would give a result of 68,58%
BitDefender

bdc --all --arc --nor $FILESDIR

Results:
Folders           :3
Files             :5104
Packed            :0
Archives          :33
Infected files    :4794
Suspect files     :5
Warnings          :0
Identified viruses:1281
I/O errors        :0
Files/second      :19
Scan time         :00:04:23

BitDefender got 4799 files out of 4987 which would give a result of about 96,23%
F-Prot Antivirus

f-prot $FILESDIR -ai -collect -archive=3 -packed

Results of virus scanning:

Files: 4987
MBRs: 0
Boot sectors: 0
Objects scanned: 5117
Infected: 1329
Suspicious: 3360
Disinfected: 0
Deleted: 0
Renamed: 0

Time: 13:38

F-Prot got 4689 files out of 4987 which would give a result of about 94,02%