See the below screen shot taken from Ubuntu 15.10, I’m using latest version of Clam AV 0.98.7.
Clam AV doesn't disinfect files, it either moves or removes them. For example, if using Wine and it deletes an infected file, it could break a program without having the data saved.
Clam AV update process started at Mon Sep 22 2014 WARNING: Your Clam AV installation is OUTDATED!
Having said that, if one is already available, ensure that it is up to date The link and see if there is a suitable package there. This means it will look for signatures on the system and try to use those.
By updating, you probably mean you want to update them yourself.
Sometimes, simply removing infected files can cause even more problems or breakages.
I suggest that you should always check the output first and then take manual action.
Linux OS is virus free (hard for viruses to run on it) even though its hard for virus, due to technology improvement day by day virus & malware strength is increased.
So there are many reasons you might need a virus scanner on your Linux system.
Those however who do want to be able to scan their system or other windows-based systems that are connected on a Linux PC through a network, they can use Clam AV.