President Signs $5.6 Billion Bill to Bolster Bioterror Defenses
Update: President Bush signed legislation Wednesday designed to help protect the United States against biological and chemical attacks by encouraging development of drugs and vaccines. (7/21/04)

Investigators Look for Links to Past Ricin Letters
Investigators intensified efforts Wednesday to determine whether the letter that brought the deadly poison ricin to a Senate mail room is linked to similarly contaminated letters apparently found last fall at mail facilities serving the White House and a South Carolina airport. (2/4/04)
Update: Investigation Seeks Source of Ricin Sent to Senate

Profiles of the six highest-priority threats, according to the CDC. These threats differ widely in terms of their severity, how they spread and whether they can be treated or prevented.

Details on the smallpox vaccine: how it works, what the risks are and how it may be used in the future.

News for students: Health officials debate the best way to prevent a bioterror attack.