protozoan

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

From Science Daily ● Dec. 21, 2025

A research team placed Halteria ciliates—a type of protozoan with hairlike organelles found in freshwater worldwide—in a petri dish with only chloroviruses, which infect green algae.

From Science Magazine ● Jan. 11, 2023

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

Another common parasite is Plasmodium falciparum, the protozoan cause of malaria, a significant disease in many parts of the world.

From Textbooks ● Jun. 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

Insects are beset not only by viruses and bacteria but also by fungi, protozoa, microscopic worms, and other beings from all that unseen world of minute life that, by and large, befriends mankind.

From "Silent Spring" by Rachel Carson

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