Blister agent

A blister agent (or vesicant), is a chemical compound that causes severe skin, eye and mucosal pain and irritation. They are named for their ability to cause severe chemical burns, resulting in painful water blisters on the bodies of those affected. Although the term is often used in connection with large-scale burns caused by chemical spills or chemical warfare agents,[1] some naturally occurring substances such as cantharidin are also blister-producing agents (vesicants).[2] Furanocoumarin, another naturally occurring substance, causes vesicant-like effects indirectly, for example, by increasing skin photosensitivity greatly. Vesicants have medical uses including wart removal but can be dangerous if even small amounts are ingested.[2]

Blister agents are named for their ability to cause large, painful water blisters on the bodies of those affected.

Soldier with moderate mustard gas burns sustained during World War I showing characteristic bullae on neck, armpit and hands

Blister agents used in warfare

Most blister agents fall into one of four groups:

Sulfur mustards – A family of sulfur-based agents, including mustard gas.
Nitrogen mustards – A family of agents similar to the sulfur mustards, but based on nitrogen instead of sulfur.
Lewisite – An early blister agent that was developed, but not used, during World War I. It was effectively rendered obsolete with the development of British anti-Lewisite in the 1940s.
Phosgene oxime – Occasionally included among the blister agents, although it is more properly termed a nettle agent (urticant).

Effects

Exposure to a weaponized blister agent can cause a number of life-threatening symptoms, including:

Severe skin, eye and mucosal pain and irritation
Skin erythema with large fluid blisters that heal slowly and may become infected
Tearing, conjunctivitis, corneal damage
Mild respiratory distress to marked airway damage

All blister agents currently known are denser than air, and are readily absorbed through the eyes, lungs, and skin. Effects of the two mustard agents are typically delayed: exposure to vapors becomes evident in 4 to 6 hours, and skin exposure in 2 to 48 hours. The effects of Lewisite are immediate.

References

Center for Disease Control Archived January 22, 2005, at the Wayback Machine
Cantharidin and Meloids: a review of classical history, biosynthesis, and function Archived September 3, 2005, at the Wayback Machine

External links

Medterms.com Archived 2012-08-09 at the Wayback Machine
Medical Aspects of Biological and Chemical Warfare, Chapter 7: Vesicants

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[1] Center for Disease Control Archived January 22, 2005, at the Wayback Machine

[schmidt-2] Cantharidin and Meloids: a review of classical history, biosynthesis, and function Archived September 3, 2005, at the Wayback Machine