It has been determined that he was exposed to choloropicrin (click here), a cheimcal agent also considered to be Novichok (click here). If he had any significant exposure he would be dead right now (click here). To the left is a chart that discusses the amount of cholorpicrin needed to kill.
It has been determined by NIOSH that 0.1 ppm (0.7 mg/m3) or less of choloropicrin is the highest allowable limits in any exposure resulting in a non-disabling limit. Choloropicrin, due to it's highly reactive chlorine atoms is a cleaning agent as well as a fungicide TO KILL ANY FORM OF THE VIRUS. (there are protocols that are called "Terminal Cleaning") It is my suggestion that whoever cleaned the meeting room may have used it as a strong disinfectant and there was residue on fomite (surfaces).
There are serious issues in that room and the discussion and conclusion of this Putin instigated invasion needs to stop and now. There is very little Russia should object to considering the number of Ukrianians targeted and killed in their own cities and towns. The migration of Ukrianians out of Ukraine is extremely worrisome and requiring the support of the entire world to maintain their well being. None of this is a minor issue and Russia should not be delaying complete withdrawal rather than using the violence of war to negotiate a peace agreement that a month ago was unnecessary.
I strongly suggest far less propaganda should be at the peace tables and the withdrawal of Russian forces out of ALL of Ukraine so a sincere peaceful and PROSPEROUS state can return to the region.