Thrax is the main antagonist of the 2001 Warner Bros. hybrid film Osmosis Jones). He is a deadly virus that comes from a filthy egg and his main goal is to kill human bodies so that he can make a name for himself among other viruses. There are different theories about what kind of virus Thrax is. According to one theory, Thrax is the rabies virus because he attacks the brain. Another theory suggests that Thrax is a cytomegalovirus that has become lethal because cytomegaloviruses are DNA viruses that exceptionally attack the brain. A third theory is that Thrax is a human immunodeficiency virus because Frank touched a chimpanzee before he caught Thrax. However, there is also a fan theory that Thrax is not a real virus, but rather an autoimmune disorder that hijacks a white blood cell.