After being infected by a Patient Zero, Vortilus isolated himself and contracted the zombie virus- however his strain preserved his brain entirely, killing his nerves but not his organs, and halted decomposition after a certain point. After making peace with the U.S government, he worked with the CDC to create safe zones around America, using his unique ability to be immune to zombie's attention or infection to either move them away or take them out. Polite, comically confused sometimes.