Single-cell

It's a single-cell organism.

Source: tatoeba (2065142)

Roughly 253 scientists from 21 countries worked for five years to decipher the genetic blueprints of the single-cell parasites that cause sleeping sickness, leishmaniasis and Chagas disease. Experts say the disease-causing protozoa, which affect 500 million people in the tropics and sub-tropics at any one time, look identical under the microscope, but are spread by different flying insects.

Source: tatoeba (12158719)

The chicken industry loses billions of dollars worldwide because of a disease called coccidiosis. Coccidiosis is caused by parasites. The single-cell organisms infect and destroy cells in the intestines.

Source: tatoeba (12268352)

Amoebic dysentery is a type of diarrheal disease that affects millions around the globe annually. Passed around by contaminated water, amoebas get into people's intestines, causing bloody diarrhea. If left untreated, these single-cell organisms can eventually perforate the intestines, spread throughout the body and kill the host. As Rose Hoban reports, researchers are learning more about the amoeba's ability to outwit the body's immune system.

Source: tatoeba (12286601)