1. Phthiraptera
hog lice spread pox virus and cattle lice spread rickettsial anaplasmosis)   Biting lice do not usually spread disease pathogens, but heavy infestations in poultry can cause severe skin irritation, weight loss, and reduced egg production.
http://www.cals.ncsu.edu/course/ent425/compendium/phthir~1.html

2. eMedicine - Pediculosis : Article by Lyn Guenther, MD -- Emedicine Clinical Knowledge Base
pediculosis, lice, infestation, crabs, louse infestation, lice infestation, ectoparasites, pubic lice, head lice, body lice, Pediculus humanus capitis, P humanus capitis, Pediculus humanus corporis, P humanus corporis, Phthirus pubis, P pubis,...
http://www.emedicine.com/med/topic1769.htm

3. Lice -- West Virginia University
Severe infestations with sucking lice can result in significant blood loss and anemia. Cattle with louse infestations scratch against poles and trees due to itching and irritation caused from the biting, sucking, and aimless wandering of these...
http://www.wvu.edu/~agexten/pubnwsltr/TRIM/10636.htm