Biological Releases
The term deliberate release refers to any intentional spread of a biological agent, such as might occur in a biowarfare or bioterrorist incident. A release may be overt or covert.
An overt release is clearly identifiable - there may have been prior warning, or the release may be apparent, either due to the use of an explosive device, or because a suspicious substance is obviously visible.
Alternatively a release may be covert, with a concealed release of an agent. In these circumstances, the release will not become apparent until the first cases of disease arise.
Recent Updates
4 June 2008: 
Emergency Clinical Situations Algorithm (PDF, 195 KB)
4 February 2008: Revised Smallpox guidelines
20 December 2007: Updated Review of Antibiotics (PDF, 129 KB) (v1.3 December 2007)
03 December 2007: Updated bibliography
Generic Guidance
- CBRN incidents: clinical management and health protection
- Dealing with Suspect Packages and Materials ('white powder' incidents)
- Unusual Illness Guidelines
- Clinical training slides