Asthma - Pests & pesticides can trigger asthma, from Environmental Health Watch.
Bed bugs - From eMedicine, see our Public Health Pest Problem Solver for more info on this pest and less-toxic solutions
Delusional Parasitosis - Comprehensive web site by Univerisity of California, Davis
Entomophobia & Delusional Parasitosis - Article from Insects in Psychiatry
Head lice - Info from CDC, see our Public Health Pest Problem Solver for more info on this pest and less-toxic solutions
Insect stings - Diagnosis & treatment, from the Merck Manual
Poisonous snake bites - Diagnosis & treatment, from the Merck Manual
Spider bites - From the Merck Manual