I looked at the garden dust and it says it is 0.03% pyrethrins. Is this enough to make a difference? I'm pretty liberal with my use of DE and that didn't prevent this. I called my vet, who won't handle poultry professionally, but advized me as a fellow chicken owner to try frontline spray applied one drop on the skin between the shoulders and one drop near, but not in the vent. We did that last night, so fingers crossed we start to see a difference. She told us that we didn't need to a withdrawal time on the eggs because of how frontline works (in the skin fat, or something, but not circulating in the blood), but we're doing it anyway because we're putting a lot of chemicals on the poor thing. We're still going to keep dusting the hens and coop and run, but we aren't going to try to flea bath because it might impact the effectiveness of the frontline. The vet told me some people think frontline is bad for the chickens, but if I stick to that dosage, she believes it should be OK. She also pointed out that it's definitely less fatal to them than having my husband cull them. I'll keep you all posted on how it goes, they look the same today as they did yesterday, but I expect it ll take a little more time.