Ok thank you so much for that helpful link! I thought my DE powder in their food would keep them safe ugh. Guess not lolalways learning with chickens! I'm so happy for this website. Thanks again!!!
Check the rest of the flock over well (nighttime is a good time to look at vents) to see if anyone else has any critters. If they do, then you may want to clean out and treat your coop as well.
Does your flock dust bathe regularly?