Centers for Disease Control and Prevention (CDC) has labeled some of the rare but infectious microorganisms as Bioterrorism Agents. These bioterrorism agents or the disease caused by these agents are categorized as ‘Category A’, ‘Category B’, and ‘Category C’ on the basis of their risk to national security.
Category A agents are
Francisella tularensis is a gram-negative coccobacillus and is the etiologic agent of tularemia. It is transmitted to humans from rodents and rabbits.
Gram positive, anaerobic rod which produces powerful neurotoxin "botulinum toxin".
Yersinia pestis is a short gram-negative rod, responsible for deadly zoonotic disease, plague.