Biological agents that

Antagonist Biological agent that reduces the number or disease-producing activities of a pathogen. 

Stressor is a chemical, physical or biological agent that can cause adverse effects in non-human ecological components ranging from organisms, populations, and communities, to ecosystems (Smrchek and Zeeman,... 

Pathogen Biological agents that are disease-producing microorganisms, such as bacteria, mycoplasma, rickettsia, fungi, or viruses. 

Hundreds of biological agents are candidates for terrorist weapons however, some are more likely than others. The U.S. Department of Defense published a list of the 17 most likely biological agents that fall into three categories ... 

This section addresses the bacterial forms of biological agents that would most likely be considered by terrorists ... 

This section addresses the viral forms of biological agents that would most likely be considered by terrorists. They include variola major (smallpox), Venezuelan equine encephalitis (encephalitis), Crimean Congo hemorrhagic fever, and Rift Valley hemorrhagic fever. 

Although worries abound over contamination of the water supply, in reality, the task is quite difficult to accomplish. For example, a contaminant can be dumped into a reservoir, but studies show that the chemical does not mix throughout the entire body of water, even after many hours. There are multitudes of chemical and biological agents that can be used to contaminate the water supply, but all contaminants do not behave similarly. Not all contaminants are threats—some become unstable in water, while others require such large quantities to do harm that they could never be dumped without being noticed. Additionally, if a disinfectant residual is maintained in the water distribution system, that residual will react with the contaminant, and the populace will remain relatively safe. It will be extremely difficult for terrorists to successfully contaminate the water supply. 

Biological agents that block TNF, e.g. etanercept, infliximab are finding their place amongst drugs that modify the course of rheumatoid disease (and Crohn s disease, see p. 65). 

A chemotherapy drug is a chemical agent used to treat diseases. The term may be applied to a drug used to treat infection, but more frequently is used to refer to drugs used to treat cancer. The term, cancer chemotherapy, is used by some to include biological agents that are used to treat cancer while others prefer to use the more specific terms biotherapy, cancer biotherapy, or biologic therapy of cancer. 

No guidelines exist for what are acceptable or safe long-term exposure levels of chemical or biological agent that remains after decontamination. Studies should be undertaken to set the appropriate levels for short- and long-term exposures and address whether standards should differ between civilian and military environments. 

To enhance sensor performance, expand the number of biological agents that can be detected and improve sample preparation for representative naval environments. 

In immunosuppression, one or more parts of the immune system are impacted. This results in impaired immune system function and reduced resistance to foreign chemical and biological agents that attack the body and can lead to increased incidence of infectious disease and cancer. 

---