Which of the following is NOT a Category A bio terrorism agent?

Avian Influenza is not classified as a Category A bioterrorism agent. Category A agents are those that pose the highest risk to national security due to their ease of transmission, ability to cause high mortality rates, and potential for widespread panic and public disruption. Examples of Category A agents include anthrax, botulism, plague, tularemia, and smallpox.

While Avian Influenza can indeed be serious and is a significant public health concern, it is primarily a zoonotic virus with a complicated transmission pathway and doesn't meet the same criteria as Category A agents in terms of direct bioterrorism potential. The risk associated with Avian Influenza is generally more related to naturally occurring outbreaks and does not fall under the same level of threat as the other agents listed, which have defined potential uses in bioterrorism scenarios.