antibiotic: A medicine that can destroy harmful bacteria in the body or limit their growth; used to treat bacterial infections.

antibodies: Protein molecules produced by the body to kill germs, fight disease, and eliminate foreign substances.

cidofovir: A drug that interferes with DNA replication that may help prevent smallpox if given within a day or two of exposure.

complications: Additional medical problems caused by an illness or a vaccination.

Dark Winter:Awar game conducted by American officials in June 2001 to increase awareness of the type of threat posed by a surprise smallpox attack on the United States.

DNA (deoxyribonucleic acid): A chemical substance that usually makes up chromosomes; composes the genetic material of some viruses.

enzyme: A chemical substance produced by living cells that regulates the speed of body processes.

immune system: The body system that defends the body against infection, disease, and foreign substances.

inoculation: A procedure...