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

An example of a positive chemotaxis is exhibited by the unicellular protozoan Tetrahymena thermophila.

From Textbooks ● Jun. 9, 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

There is another protozoan, called blepharisma, telling a long story about the chanciness and fallibility of complex life.

From "The Lives of a Cell" by Lewis Thomas

Organisms that can survive in this suspended, or anabiotic, state, Yarzábal explained, include not just extremophile bacteria but also viruses, fungi, protozoa and microscopic animals called nematodes.

From Salon ● Apr. 20, 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

Far from recognizing that protozoa were different in character from larger organisms, Leeuwenhoek’s work seemed to imply that they were the same.

From "The Invention of Science" by David Wootton

That figure does not even count certain bacteria, viruses, fungi and protozoans that are also considered to be parasitic.

From New York Times ● Jan. 9, 2023

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

From Reuters ● Oct. 1, 2022

And just like a tapeworm or malaria protozoans, it doesn’t care if it disables or kills its host.

From Slate ● Mar. 29, 2017

The working group came up with 16 “climate-sensitive zoonotic pathogens of circumpolar concern”, consisting of 7 types of bacterium, 4 families of virus, 3 protozoans and 2 kinds of worm3.

From Nature ● Mar. 28, 2017

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