To quote the website:
ClamXav is a trusted and highly recommended anti-virus and malware scanner for Mac OS X with the ability to detect both Mac and Windows threats.
Can I ask what is it you think ClamXav is doing for you?
Perhaps you are unfamiliar with the term Malware which is an umbrella term used to refer to a variety of forms of hostile or intrusive software, including computer viruses
, worms, trojan horses, ransomware, spyware, adware, scareware, and other malicious programs.[source]
Using the technical definition of a computer virus
, there are no known viruses that can impact macOS/OS X or it's applications and there never has been, so the only thing ClamXav is looking for is Windows Viruses and all other types of Malware (including Mac malware).
Perhaps a change in your user name here is in order