Bacteria and viruses are made from chains of protein as are our bodies. The Immune System Our bodies are continuously under attack from foreign invaders such as environmental toxins, pollutants, and germs. The immune system is our bodies natural defense mechanism against these attackers. The immune system is made up of white blood cells, organs and structures whose mission it is to identify and destroy disease causing organisms such as bacteria, viruses, fungi, and parasites. It's the immune systems job to protect the body against these foreign invaders.
Immunology is the study of the immune system.
It's medical research includes all the cells, chemicals, and organs that defend the body against disease. Viruses are not self-sufficient and must invade living cells, using that cells own machinery in order to reproduce. A virus must invade, destroy, and occupy another cell to live. Fungi is a life form slightly more advanced than bacteria but not as developed as plants, and include molds, rusts, mildews and yeast. Parasites are organisms that feed, grow and take shelter in other organisms acting as the host.