I didn't read anything about Ivermectin in there, but it was helpful. Now I know that all the mites I have had are red mites, not anything else.
Good read.
http://parasitipedia.net/index.php?option=com_content&view=article&id=2344&Itemid=2996
Sorry Lucas , in this link it explains that macrocyclic lactones ( ivermectin ) have no effect on mites or intestinal worms in poultry . Ivermectin can also be quite toxic in chickens.