It's easy to see this as a close cousin to the zombie genre of which it's creator is the undisputed king. However, it flips the script, presenting a world in which nearly everybody is the bad guy. It's commentary on how well meaning government policy can become barbaric when implemented through brute force was obviously intended for the Vietnam War, but it's interesting to consider in a literal post pandemic world. It often favours this allegory over realism, but if you can accept the exaggerations along with a few other low budget trappings, the grisly action and deep cynicism make for a wild ride.