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Protozoa are single-celled microorganisms. While many protozoa benefit man by feeding on bacteria, others are parasitic to humans and animals and cause serious diseases.

Protozoa are more complex than bacteria.  The genetic material (contained in chromosomes) of protozoa is separated from the cell fluid (cytoplasm) by a double membrane layer.  Also, the cytoplasm of protozoa is more highly organized, similar to the situation in animal cells.

There are many sources of infection from parasitic protozoa.  Sources of infection include, but are not limited to, contaminated food or water, infected animals or insect bites.

In this part of our lesson on infectious agents, we will discuss some common parasitic protozoa and how to protect yourself from infection.




Common Properties | Bacteria | Virus | Protozoa | Fungi