Doctor Hector Zepeda, a teacher at Mexico's Instituto Politecnico Nacional, looks at a monitor displaying the Anthrax bacteria under the microscope in his laboratory October 23, 2001. The Politecnico Nacional, one of Mexico's most prestigeous higher education centres, keeps the Anthrax virus on campus and it is used for teaching and learning purposes by students studying Chemistry, Bacteriology and Parasitology. The Anthrax bacteria has caused panic accross the United States after spores were mailed to several prominent individuals, two people are known to have died from exposure.