Frank Heckers
Bacteria: Tiny
single-cell life forms that reproduce easily. Bacteria live in food
and water and can survive on humans, too. Strep throat and
E. coli are examples of bacterial infections.
Parasites: Organisms that live
in or off a host, feeding
off its tissues and fluids. Giardia, a common parasitic infection in the United States, spreads through contaminated drinking water and can cause diarrhea and cramps.
Fungi: Organisms, including yeasts, that can live in air, water, soil, and plants. Fungi can cause irritating infections and allergies, such as candida and athlete’s foot.
