41.   Last week the Centers for Disease Control and Prevention applied for permission to use anthrax vaccine on these terms.

42.   Medical experts say the use of an anthrax vaccine could help shorten the period of treatment, even if it were administered after exposure.

43.   Much attention has been paid to the toxin itself, which has long been the target of anthrax vaccines.

44.   No one knew the risk-benefit ratio of using the anthrax vaccine.

45.   No anthrax vaccine is available for civilian use, and even military supplies are of doubtful efficacy.

46.   Officials from the Department of Defense and the Department of Health and Human Services did not respond to requests to discuss the anthrax vaccine and a possible attack.

47.   On Monday, President Bush signed an executive order to help expedite the production of vaccines, including the anthrax vaccine.

48.   Only one company, BioPort of Lansing, Mich., is licensed to make anthrax vaccine.

49.   One of the causes eliminated Thursday was the anthrax vaccine injected in thousands of soldiers in the event Iraqi leader Saddam Hussein unleashed the lethal virus.

50.   Peters noted that all of the advances in developing anthrax vaccines had occurred because scientists had had access to the cultures.