Ash, I am sorry for your loss, that's quite a blow.
I haven't lost any, and they dont seem to be having any side effects. I treat them and check and think I got them and the next thing I know the kids or myself pick somebody up and theres the bugs! It's very frustrating! Just to be clear, these are not Lice, and the feather mites went with one dusting and havent been back, it is the Northern Fowl Mites I cant get rid of. I even looked at them under a microscope to ID them.
RE the headlice... we did that dance a couple years ago. The lice have become resistant to the medications. After 2 rounds of the over the counter stuff, we went to the doctor and got a prescription, whick still did not work. It wasnt from reinfestation, there were living lice after the treatments while I was still combing them out. Then I went to the health foos store and found Neem Oil. It is AWESOME. It kills them fast! It is safe, non toxic, you can eat it in fact! It is very thick you have to warm it up a little to be able to use the dropper with it or pour it. I used it directly on our heads for the first treatment, mixed with a little olive oil. You have to get the nits with a comb or your fingers, but combing is much easier with the oil than after the chemical shampoo's. After that you just add a few drops to your shampoo and use it like normal. You will never see lice again because it kills and no bugs will get near you with that stuff on. It even kept the blackflies at bay. Usually they are in my hair and biting my scalp and the back if my neck even after I have come inside, but not that spring! And I do it in the spring now just to keep away the blackflies. It is awesome stuff! It does have a strong odor, like musky garlic, but it is not real noticeable in the shampoo. Totally worth it. Try it, trust me!
I used hay in the solarium this year, and it is the first time I have ever had the mites...back to the bark mulch for sure!
Edited b/c of mobile issues, as usual...