BitDefender is build by a Romanian company headquartered in Belgrade. We currently use BitDefender because it's one of the top-rated antivirus programs while also being one of the least resource-intensive a/v programs out there.
Our runner-up was ESET, a product of Slovakia. Eset is also very highly rated and light on resources, and focuses on being an antivirus program, which is great.
We also tried Avire at some point in time, seems nice enough. Can't remember why we uninstalled it...too high on system resources perhaps?
We used Kaspersky for all of 2018. The free version is great and very highly rated, unfortunately it's not possible to turn off SSL certificate swapping (necessary for it to scan https traffic). This got in the way of checking whether we correctly deployed updated Letsencrypt certificates for our own sites, because Kaspersky would keep loading its own certificate in place of ours.
We considered the paid option, but during our research we learned of various allegations about Kaspersky having close ties with the Russian government. Maybe these allegations are unfounded, maybe not, in any case we looked around some more.
Before Kaspersky, we were big fans of Avast, until they started showing too many annoying pop-up ads for their various products. True, we were using the free version and perhaps the paid version shows fewer ads, but in any case we decided to try some others.