Dental Specialties in US. The American Dental Association recognizes nine dental specialties in which dentists can get additional training and practice in addition to or instead of general dentistry: 1  Dental public health-Study of dental epidemiology and social health policies.
Trichinella spiralis is a parasitic worm that causes the disease Trichinosis. A whipworm is a roundworm that infects the large intestine. Whipworms are found commonly in pork and are often called pork-worms. They are also found in rats, humans, dogs and cats.
Phylum Platyhelminthes. 1. The Phylum Platyhelminthes (flatworms) includes planarians (Class Turbellaria), tapeworms (Class Cestoda), and flukes (Class Trematoda). The planarians are harmless, free-living flatworms. They live in an aquatic environment (freshwater or marine) or on moist soil.