I really liked this film. It's not without its flaws, but I give it major points for a unique, interesting concept and its sterile visual style.
As a horror and sci-fi fan, I wish there were more films like Antiviral. Ones, that either on their own or by effectively combining the two genres, bring new ideas to the table and use thoughtful art direction. Sadly nowadays, most just regurgitate the same old concepts and then throw gratuitous amounts of special affects on top to make them feel "new". Antiviral seems to step out of that box.
As mentioned, it isn't perfect, but a really great film for sci-fi/horror fans looking for something less cliché and more unique, something that can be hard to find within these genres today.
It's a pretty low-budget film, so don't expect a ton of crazy sci-fi special effects. But this is exactly one of the things that works for it. It feels futuristic, but only just enough so that it feels like the not TOO distant future. This fits perfectly with the idea of people being so obsessed with celebrities they pay to be infected with their diseases. Since our society is already relatively obsessed with celebrity culture, Antiviral's world feels distant, but not too far off.
One issue is that the plot can feel a bit unfocused here and there. Viewers won't feel lost, but this flaw does prevent Antiviral from being a really solid film. Also, the acting and dialogue feel contrived at times. But I did enjoy Caleb Landry Jones's portrayal of Syd.