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Biological agents, also known asbiological weapons orbioweapons, arepathogens used as weapons. In addition to these living or replicatingpathogens,toxins andbiotoxins are also included among the bio-agents. More than 1,200 different kinds of potentially weaponizable bio-agents have been described and studied to date.

Some biological agents have the ability to adversely affecthuman health in a variety of ways, ranging from relatively mildallergic reactions to serious medical conditions, including serious injury, as well as serious or permanent disability ordeath. Many of these organisms are ubiquitous in thenatural environment where they are found in water, soil, plants, or animals.^[2] Bio-agents may be amenable to "weaponization" to render them easier to deploy or disseminate.Genetic modification may enhance their incapacitating or lethal properties, or render them impervious to conventional treatments or preventives. Since many bio-agents reproduce rapidly and require minimal resources for propagation, they are also a potential danger in a wide variety of occupational settings.^[2]

The 1972Biological Weapons Convention is an international treaty banning the development, use or stockpiling of biological weapons; as of March 2021, there were 183 states parties to the treaty.^[3] Bio-agents are, however, widely studied for both defensive andmedical research purposes under variousbiosafety levels and withinbiocontainment facilities throughout the world.

The formerUnited States biological weapons program (1943–1969) categorized its weaponized anti-personnel bio-agents as either "lethal agents" (Bacillus anthracis,Francisella tularensis,Botulinum toxin) or "incapacitating agents" (Brucella suis,Coxiella burnetii,Venezuelan equine encephalitis virus,staphylococcal enterotoxin B).^[4]

Since 1997, United States law has declared a list of bio-agents designated by theU.S. Department of Health and Human Services or theU.S. Department of Agriculture that have the "potential to pose a severe threat to public health and safety" to be officially defined as "select agents" and possession or transportation of them are tightly controlled as such.^[5] Select agents are divided into "HHS select agents and toxins", "USDA select agents and toxins" and "Overlap select agents and toxins".

The USCenters for Disease Control and Prevention (CDC) breaks biological agents into three categories:Category A, Category B, and Category C. Category A agents pose the greatest threat to the US. Criteria for being a Category "A" agent include high rates of morbidity and mortality, ease of dissemination and communicability, ability to cause a public panic, and special action required by public health officials to respond. Category A agents includeanthrax,botulism,plague,smallpox, and viral hemorrhagic fevers.

The following pathogens and toxins were weaponized by one nation or another at some time. NATOabbreviations are included where applicable.

Simulants are organisms or substances which mimic physical or biological properties of real biological agents, without being pathogenic. They are used to study the efficiency of various dissemination techniques or the risks caused by the use of biological agents inbioterrorism.^[7] To simulate dispersal, attachment or the penetration depth in human or animal lungs, simulants must have particle sizes, specific weight and surface properties, similar to the simulated biological agent.

The typical size of simulants (1–5 μm) enables it to enter buildings with closed windows and doors and penetrate deep into the lungs. This bears a significant health risk, even if the biological agent is normally not pathogenic.

• Bacillus globigii (historically namedBacillus subtilis in the context of bio-agent simulants) (BG, BS, or U)
• Serratia marcescens (SM or P)
• Aspergillus fumigatus mutant C-2 (AF)
• Escherichia coli (EC)
• Bacillus thuringiensis (BT)
• Erwinia herbicola (current accepted name:Pantoea agglomerans) (EH)
• Fluorescent particles such aszinc cadmium sulfide, ZnCdS (FP)

While thehistory of biological weapons use goes back more than six centuries to thesiege of Caffa in 1346,^[9] international restrictions on biological weapons began only with the 1925Geneva Protocol, which prohibits the use but not the possession or development of chemical and biological weapons in international armed conflicts.^[10] Upon ratification of the Geneva Protocol, several countries madereservations regarding its applicability and use in retaliation.^[11] Due to these reservations, it was in practice a "no-first-use" agreement only.^[12]

The 1972 Biological Weapons Convention supplements the Geneva Protocol by prohibiting the development, production, acquisition, transfer, stockpiling and use of biological weapons.^[13] Having entered into force on 26 March 1975, this agreement was the first multilateral disarmament treaty to ban the production of an entire category of weapons of mass destruction.^[13] As of March 2021,183 states have become party to the treaty.^[3] The treaty is considered to have established a strong global norm against biological weapons,^[14] which is reflected in the treaty's preamble, stating that the use of biological weapons would be "repugnant to the conscience of mankind".^[15] However, its effectiveness has been limited due to insufficient institutional support and the absence of any formal verification regime to monitor compliance.^[16]

In 1985, theAustralia Group was established, a multilateral export control regime of 43 countries aiming to prevent the proliferation of chemical and biological weapons.^[17]

In 2004, theUnited Nations Security Council passedResolution 1540, which obligates all UN Member States to develop and enforce appropriate legal and regulatory measures against the proliferation ofchemical, biological,radiological, andnuclear weapons and their means of delivery, in particular, to prevent the spread of weapons of mass destruction tonon-state actors.^[18]

• Biological hazard
• Biological contamination
• Laboratory Response Network
• Pulsed ultraviolet light

• Rafał L. Górny,Biological agents,OSHwiki (Archived 2023-01-30 at theWayback Machine)
• Biological Agents, OSHA
• Select Agents and Toxins, Centers for Disease Control and Prevention
• Biological weapons e-learning module in the EU's non-proliferation and disarmament course (taught byFilippa Lentzos)

• Biological agents
• Biological contamination

• Articles with short description
• Short description matches Wikidata
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