Public health authorities have developed a system to prioritize biological agents according to their risk to national security. government agencies are involved in planning responses to potential biological attacks.īioweapon threats could include the deliberate release by attackers of an agent that causes one or more of a variety of different diseases. Biological attacks, however, have occurred in the past, one as recently as 2001. And indeed, the possibility of such an attack may be very remote. A biological attack by terrorists or a national power may seem more like a plot element in an action film than a realistic threat.