I would definitely install Virus-Z from aminet and immediately run a file check on your hard drive. I went for many years, thinking that no-one would bother writing a virus for Amigas anymore, etc.
Recently I was setting up an A500 and noticed things acting wierd. Installed Virus-Z and ran a scan. It found the Ebola virus attached to a hundreds of the files on this newly set up computer (it got infected through some piece of software I installed and replicated itself).
Then I ran Virus-Z on my WinUAE setup that is several years old, and there, too was the Ebola virus.
This is an old virus from the 1990s, but it is still harmful.
I would install an anti-virus program especially if you plan to trade software with other Amigans or download .adf software from the internet.