Question of the Day – Monday February 4, 2019

Question – What are the so-called “fourth generation agent” (FGS) chemical weapons?

Answer- The cited reference notes “FGAs are chemical warfare agents (CWAs) that are unique organophosphorus compounds. They are more persistent than other nerve agents and are at least as toxic as VX.” FGA’s are also known as Novichoks or A-series nerve agents. The CHEMM website ( states: “While fourth generation agents share similar characteristics with other nerve agents, fourth generation agents pose several unique challenges in terms of toxicity, detection, persistence, and potential for delayed onset of symptoms.” (; accessed January 2019)