I went though a chicken lice problem. The dusting helped.  Right now you need to check the chickens in the dark.  Go out about couple of hours after dark with a strong flashlight and look for your parasite. Check the vents area and every where else you can think of.  I don't thing you chicken would be alive if it was stick fleas, the took out two flocks I know of here in the south, but they can travel.  And she had a nice red wattle....good luck I know your frustration.   r
	
		
			
		
		
	
				
			 
	 
 
		 
 
		 
	 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		