Diseases: Canine and feline distemper, parvovirus, pseudo rabies, tuberculosis and rabies are all known to occur in raccoons.
Parasites: Ticks, lice, fleas, botfly larvae, roundworms, flukes and tapeworms may parasitize Raccoons. The Raccoon Roundworm (Baylisascarishas procyonis) has brought a lot of attention recently.
Wildlife Specialties Inc.
Link to Centers for Disease Control and Prevention Baylisascaris Fact Sheet.
Link to Centers for Disease Control and Prevention on Baylisascaris infection.