I am not sure what you are asking but if you meant:
Where can we see what were the latest virus that were detected by avast a.k.a virus signatures, you can see here:
http://www.avast.com/en-in/virus-update-historyOr if you meant, where can we see the viruses that were detected by avast and quarantined so that you can restore back, you will find that in
Avast>Scan>Quarantine (Virus Chest)