Tularemia is Category A Agent as listed by the CDC.

Some other sites for Tularemia are:
http://www.bt.cdc.gov/agent/tularemia/index.asp
http://www.nlm.nih.gov/medlineplus/ency/article/000856.htm
http://www.emedicine.com/emerg/topic591.htm
http://www.osha.gov/SLTC/tularemia

Other Category A agents identified by CDC are:
Anthrax
Botulism
Plague
Viral Hemorrhagic Fever (ex. ebola)
Smallpox
Tularemia

CDC guidelines for Category A Agents defined as:
The U.S. public health system and primary healthcare providers must be prepared to address various biological agents, including pathogens that are rarely seen in the United States. High-priority agents include organisms that pose a risk to national security because they

can be easily disseminated or transmitted from person to person;
result in high mortality rates and have the potential for major public health impact;
might cause public panic and social disruption; and
require special action for public health preparedness.