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.
The following are the three classifications: 1  Annelida â This group is probably the most recognized of the three worm classifications. 2  Nematoda â This phylum of worms includes roundworms, hookworms and threadworms. 3  Platyhelminthes â The worms in this group are flat or ribbon-shaped. Nematoda â This phylum of worms includes roundworms, hookworms and threadworms. 2  Many roundworms are parasites and can cause a variety of problems for people and pets. 3  Threadworms live on the ground in damp soil, mossy areas or in decaying vegetation. 4  They can also be found in freshwater and saltwater.