The Centers for Disease Control and Prevention (CDC) is developing a clinicians' registry to provide real-time information to help prepare clinicians to respond to terrorism and emergency situations. As a participant, you will receive regular updates on terrorism and emergency response issues targeted to clinicians. To participate, please go to http://www.bt.cdc.gov and click on "Clinician Registry for E-Mail Updates on Terrorism and Emergency Response" under featured links. Follow the instructions for entering your e-mail address. You will not be asked to enter your name or other personal information, and the CDC will not share your e-mail address with anyone else.