The US government and its many agencies and educational and health institutions, have for many decades conducted intensive research into biological warfare, in many cases strongly focused on race-specific pathogens.
Erdogan will not risk with a direct military confrontation with Russia. Nevertheless, if the Turkish leadership is sure that Russia provides no real answer to a full-scale attack on the Syria Army, there will be a strong chance that Turkey will carry out such an attack.
Trump said candidly that in not ordering a military response from that point, he "stopped something that would have been very devastating for" the Iranians.