protozoan

Giardia duodenalis is a microscopic protozoan parasite known for causing outbreaks of severe diarrhea.

From Science Daily ● Dec. 21, 2025

One common protozoan disease known to occur in birds, which evolved from feathered dinosaurs, as well as in people is called trichomoniasis, caused by a parasitic protozoan.

From Reuters ● Oct. 1, 2022

Though the idea of a mind-altering protozoan transmitted via cats is alarming, it is not necessarily harmful: roughly 30 percent of the human population is infected with the T gondii parasite.

From Salon ● Apr. 19, 2022

The disease is caused by Trypanosoma cruzi, a protozoan transmitted by triatomine insects, known as kissing bugs for their vampiric penchant for biting the face and sucking blood.

From Science Magazine ● Mar. 9, 2022

These, under high magnification, turn out to be bacteria, living in symbiosis with the spirochetes and the protozoan, probably contributing enzymes that break down the cellulose.

From "The Lives of a Cell" by Lewis Thomas

The host of life on ice includes bacteria, viruses, fungi, protozoa, even microscopic animals like nematodes, some dead and some alive in suspended animation.

From Salon ● Apr. 24, 2025

It seems miraculous that, over billions of years, our planetary circumstances enabled protozoa to evolve into people.

From New York Times ● Nov. 12, 2023

Bottom line: If you must have tropical milkweed, cut it down to the ground each fall before it goes to seed, to kill any overwintering protozoa and reduce its potential to spread to neighboring areas.

From Los Angeles Times ● Oct. 30, 2023

Food turns into compost through the hard work of small microorganisms like bacteria, fungi, and protozoa.

From National Geographic ● Sep. 26, 2023

Ben had awakened that morning, while it was still dark, with the butterflies, the old, invisible protozoa of fear that invaded the stomach on the days of contests or of testing.

From "The Great Santini" by Pat Conroy

The researchers explored whether the holes had been caused by an infection involving microbes called protozoans.

From Reuters ● Oct. 1, 2022

The broadest definition of “parasite” includes pathogens such as bacteria, viruses, fungi and protozoans.

From Scientific American ● May 18, 2022

Single-celled protozoans, for example, use some genes to make proteins that let them cling together in tiny colonies.

From New York Times ● May 4, 2018

His companion guide to garden science is a learned romp through plant biology; solar energy and soil nutrients; the movement of vines; and “fellow gardeners”, from single-celled protozoans to beetles.

From Nature ● Mar. 20, 2018

The scoutmaster had given them a long lecture about disrupting nature—by the end of it, Jonah felt guilty about how many protozoans he’d probably killed.

From "Found" by Margaret Peterson Haddix