What did you dust them with?I would definately go ahead and dust them just in case....if you can catch your chickens...look at the area around the vent and lift up the feathers above and watch for about a minute...if they are there you will see them running around.....if you dust be sure and get under wings, vent area etc....mine looked like it had snowed on them by the time I got through dusting them....LOL Those things give me the creepy crawlies.....