Thrax is a virus in the movie Osmosis Jones). While there are different theories about what kind of virus Thrax is, the most common one is that he is the rabies virus because he attacks the brain. Thrax is characterized as a very tall and strong humanoid clad in black, with a long black coat that enables him to glide in the air). He is the main antagonist of the movie and is determined to kill Frank DeTorre within 48 hours, so that he can set a record for the virus to kill a man the fastest and be written about in medical books. Thrax kills his victims by stealing their hypothalamus, which he stores inside a necklace.