Microorganisms naturally inhabit and move through the body. Some are harmless, while others cause sickness. Infections can occur when parasites make their homes in our skin, gastrointestinal tract, lungs, liver, and other organs. Parasites require a host (e.g. human cells) to live and thrive. The two main types of intestinal parasites are helminths and protozoa. Helminths are ... Continue Reading